FAQ
A few things you might want to know before finding your next favourite piece.
At SIZ, we believe that choosing what you wear should feel good, from the first click to the many times you wear it afterwards. Here you'll find answers to some of the questions we get asked most often. And if there's anything else you'd like to know, we're always happy to hear from you.
About SIZ
Who is behind SIZ?
We're Raquel and Sofia, twin sisters and the designers behind SIZ. Our brand was born from a shared passion for fashion and a desire to create something of our own, with a little more thought behind every piece.
Based in Sesimbra, Portugal, we design collections that bring together timelessness, creativity and a touch of attitude, while exploring more conscious ways of making and wearing clothes.
What does SIZ stand for?
SIZ is our way of looking at fashion differently. We believe style and conscious choices can coexist beautifully, and that getting dressed can be an expression of who we are without having to follow every new trend.
Our aim is to create pieces you'll want to wear, rewear and keep for years to come. Less about having more, more about choosing what feels right.
Where are SIZ clothes made?
Our collections are designed in our atelier in Sesimbra, Portugal, and produced locally in Portugal. We work with local seamstresses and value the craftsmanship, collaboration and attention to detail that go into making each piece.
What makes SIZ different?
We're a small independent brand, and we like to keep things personal. From the first sketches and fabric research to the final details, we're closely involved in the creative process.
We work with small collections, thoughtful designs and carefully selected materials. Rather than chasing trends, we focus on creating distinctive pieces that feel relevant beyond a single season.
Materials & production
What materials do you use?
We prioritise natural and more conscious materials, including organic and deadstock fabrics whenever possible. Our choices depend on the needs of each design, always considering the look, feel and quality of the final piece. We work mainly with cotton, linen and tencel.
You can find the specific composition and material details on each product page.
What is deadstock fabric?
Deadstock fabrics are leftover materials from previous production runs or textile orders that might otherwise go unused. By giving these fabrics a new purpose, we can create beautiful pieces while making use of existing resources.
Availability is often limited, which means some fabrics and designs cannot be reproduced once they sell out.
Are your clothes made in small quantities?
Yes. We work with small batches and limited collections, allowing us to approach design and production more thoughtfully. Some pieces may be restocked when materials and production allow, but we cannot guarantee that every item will return.
How can I take care of my SIZ pieces?
We want your clothes to stay in your wardrobe for a long time. The best place to start is the care label inside each garment, as different fabrics and finishes require different care.
As a general rule, wash only when needed, preferably by hand, follow the recommended washing instructions and avoid unnecessarily harsh treatments. Taking good care of your clothes helps them last longer.
Products & sizing
How do I choose the right size?
You'll find the available sizes and any relevant fit information on each product page. We recommend checking the size guide and product description before placing your order.
If you're between sizes or unsure about a particular fit, send us an email at siz.geral@gmail.com. We'll be happy to help you find the best option.
What if an item is sold out?
Some SIZ pieces are made in very limited quantities, particularly when we work with deadstock fabrics. If an item is sold out, it may not be possible to reproduce it.
Feel free to contact us if there's a particular piece you're hoping to find. We'll let you know if a restock is possible.
Where else can I find SIZ?
Besides our online store, you can find selected SIZ pieces at independent multibrand stores in Portugal and abroad.
Follow us on Instagram at @sizbrand for updates on our collections, collaborations, pop-ups and other ways to discover SIZ.
Orders & payments
How can I place an order?
Simply browse our online store, choose your favourite pieces and add them to your bag. Follow the checkout steps to enter your delivery details, select your shipping method and complete your payment.
Once your order has been placed, you'll receive an email confirmation.
Which payment methods do you accept?
The available payment methods are displayed at checkout. Depending on your location and the options enabled, these may include card payments and other electronic payment methods.
If you have any questions about completing your payment, contact us at siz.geral@gmail.com.
Do you offer a welcome discount?
SIZ offers a welcome 10% off code on first purchases when signing up to our newsletter and joining SIZsters Club. To redeem the discount, apply the code at checkout.
Valid on full price SIZ products only. Discount is valid for 30 days from signing up.
How can I use a gift card or a promo code?
When you're ready to checkout and are looking at the items in your cart, click proceed to checkout. You will then have the option to add your discount code or promo code to your order. Please note, only one discount code can be redeemed per order.
Can I change or cancel my order?
If you need to change or cancel an order, please email us as soon as possible, including your order number.
We'll do our best to help, but changes may not be possible once your order has been processed or shipped. This does not affect any statutory cancellation rights that may apply.
Can I order a piece that is not available in my size?
You're welcome to contact us to ask. As we work with limited quantities and sometimes one-off fabrics, we cannot guarantee that a piece can be made again. We'll always let you know what is possible.
Shipping & delivery
Where do you ship?
We ship to Portugal, destinations across Europe, the United States and other international destinations available at checkout.
If your country isn't listed in the checkout options, email us at siz.geral@gmail.com and we'll see whether we can arrange delivery.
How long will my order take to arrive?
Please allow up to 3 business days for order processing before dispatch.
Estimated delivery times after dispatch are:
- Portugal: approximately 24 hours via CTT Expresso (next-day delivery for orders placed before 1pm)
- Europe: 5–8 business days via Registered Postal Service, or 2–3 business days with Express Shipping.
- United States: 3–4 business days via UPS.
- Rest of the world: approximately 5–8 business days via Registered Postal Service.
These are estimates, and actual delivery times may vary depending on the destination and carrier.
How much does shipping cost?
Shipping is free for orders within Portugal.
For international orders, shipping costs depend on the destination and the weight of your order. The available options and costs will be displayed at checkout before you complete your purchase.
Will I receive a tracking number?
Yes. Once your order has been dispatched, we'll send you a shipping confirmation with tracking information.
Will I have to pay customs duties or import taxes?
Orders shipped outside the European Union may be subject to customs duties, import taxes or other charges imposed by the destination country. Unless otherwise stated or required by law, these charges are the customer's responsibility.
We recommend checking with your local customs office if you'd like to know more before placing your order.
For more details, please visit our Shipping + Handling page.
Returns & exchanges
Can I return an item?
Yes. For online purchases, you generally have 14 calendar days from the day you receive your order to exercise your right of withdrawal, subject to applicable legal exceptions.
To start a return, email us at siz.geral@gmail.com with your order number and the item you'd like to return. We'll guide you through the process.
What condition should the items be in?
Items should be unworn, unused, unwashed and unaltered, with their original tags and labels intact. Please handle garments only as necessary to check their fit and characteristics.
If an item shows signs of use or handling beyond what is necessary to inspect it, this may affect the refund in accordance with applicable law.
Who pays for return shipping?
For returns because you've changed your mind, the customer is responsible for the direct return shipping costs, provided this has been communicated before purchase and subject to applicable law.
If your item is faulty or we sent you the wrong item, please contact us before returning it so we can help resolve the issue in accordance with your legal rights and we will cover the shipping costs.
Can I exchange an item for a different size?
Exchanges are subject to stock availability. Email us at siz.geral@gmail.com with your order number and the size or item you'd like instead, and we'll let you know what is possible.
When will I receive my refund?
Once we receive and inspect your return, we'll process the refund using the original payment method, in accordance with the applicable legal timeframe. Your bank or payment provider may need additional time to make the funds available.
What if my order arrives damaged or incorrect?
We're sorry if something isn't right with your order. Please email siz.geral@gmail.com with your order number, a description of the issue and photographs if possible.
We'll look into it and help arrange an appropriate solution. Your statutory rights regarding faulty or non-conforming products remain unaffected.
For complete information, please read our Returns + Exchanges page.
Still have questions?
We're always happy to help.
Whether you need help choosing a size, want to know more about a fabric or simply have a question about SIZ, get in touch.
Email: siz.geral@gmail.com
Instagram: @sizbrand
We may be a small team, but behind every SIZ piece there's a lot of care, thought and love. Thank you for being here and for choosing to wear with intention.
Raquel & Sofia