First Principles Denim
First Principles Denim

Our ‘Ready to Wear’ items are based on our best-selling custom products in their most popular design iterations. Our Ready to Wear collection comes in a wide range of sizes and we also offer an alterations service to help ‘customise’ the fit of our off-the-shelf jeans and shorts.

Our ‘Custom’ offering is available for those who are looking to invest in the perfect pair of jeans. Our unique online experience and try-before you-buy process using the curated FP Sample Packs, means you can create a pair of jeans that suits both your body and style, all from the comfort of your home. This is a great option for those who are looking for unique design combination or have trouble with standardised sizing. We have a small army of denim specialists there to help you throughout the process too!

We certainly do! We have our very own in-house alterations service. If you have any adjustments in mind, shoot us an email and one of our FP Denim Consultants will be in touch.

Please note, that we charge a fee for alterations. We only charge as much as is quoted by our in-house tailor and we will let you know the estimated cost before proceeding with the alteration.

Almost everything! From the design choices to the fit.

The sizing of your ‘Custom’ FP jeans can be adjusted at the waistband, upper and lower hips, and inseam length. You can also choose the waist height of your jeans, from Low, Mid, High and Ultra-High. If you think you might require further adjustments to an area such as your calf, knee, or thigh, you can get in touch with one of our Denim Consultants via email, and
we can make this happen.

You can choose to customise the design of your jeans across multiple components, from the cut of the jeans, the denim thickness, the stretch, the wash and colour, the thread colour and the hardware. Customers have the power to design a pair of jeans that suits their aesthetic, wardrobe style and seasonality – the dream!

Typically, the time taken to organise a FP Sample pack, receive it, and then finalise your custom order is about a week. This is dependent on where you are located, and how quickly you can provide us feedback and lock in your custom order with us.

Your FP Custom order will arrive at your doorstep approximately 4-6 weeks after you place your custom order via our FP Website. If there are any unexpected delays, we will communicate this to you promptly.

Each of our custom jeans is made by hand in Melbourne, Australia and we pride ourselves for being a slow fashion advocate. We know that our customers will appreciate the artisanal quality of their custom jeans and they will be well worth the wait.

If you ever have any questions about your custom order, you can always email our helpful staff at

Simply put, our FP Sample packs are a way to try-before-you-buy.

Once you complete our ‘Booty Fit’ Survey, we curate a selection of 3-4 pairs of FP Jeans which allow you and us to specify you size, design and denim preferences. For $25, customers will get to try on these jeans at home. Sit down in them, try them on with your favourite boots and shoes,  figure out what denim is best for you and where you want the jeans to sit on our waist. The FP Sample Packs give you the option to ‘try before you buy’ and assist you in determining what sizing adjustments or design options you would like to consider for your custom pair. Click here to find out more.

Don’t think you want to go ahead with an FP ‘Custom’ purchase? No worries, just book a return for your Sample pack. Please note Sample packs are non-refundable. Refer to our Terms & Conditions for more information on our refund policy.

Each Sample Pack will have a detailed instruction card provided, but if you run into some issues or just need some advice, send us an email through our Contact page and one of our Denim Consultants will be in touch the same day. If necessary, our Denim Consultants can organise a call or video chat with you.

We certainly can! Click here to head over to our ‘Contact’ page and let us know that you’re interested. A member of our support team will be in touch the same day.

Please note that we can only base our patterns off existing jeans and cannot produce a pattern off the fit of a pant or trouser. If we think we might be able to help, we will provide you with a sender’s address and assess your jeans once they arrive. Upon assessment, our team will be in touch to let you know if this is possible, and if so, to finalise your order with us.

Click here to head over to our ‘Contact’ page and let us know your question there. A member of our support team will be in touch same day. If your question requires a detailed response or you have multiple, our team will arrange a time to call you.

Purchasing a custom garment has multiple benefits for the environment. Click here to find out more.

Upparel are Australian-based sustainability champions on a mission to reduce global textile waste. While we make every effort to minimise our impact on the environment, producing new garments will always contribute to the global textile overproduction crisis – unless you swap out and repurpose some old clothes for a bootylicious new pair of FP Denim.

By clicking here you can organise a pick-up of up to 10kg of old denim and other clothing items taking up space in your closet. The service costs $25 and you can sleep easy knowing that no items sent to Upparel end up in landfill. Impact statements and reports can be accessed on their website.

With every collection you book with Upparel through First Principles, you will receive a $25 voucher* to spend on ‘Ready to Wear’ and ‘Custom’ items.

*Please note that only one First Principles x Upparel voucher can be used per transaction. For more information, please see our Terms & Conditions.

Gift vouchers* can be purchased through our ‘Ready to Wear’ Shop. You can opt to have your gift recipient receive an E-gift voucher directly emailed to them, or a physical gift card mailed to a specified address. All gift cards and E-gift vouchers expire 1 year from purchase date.

*Please note that First Principles Gift Cards are non-refundable and cannot be exchanged or transferred between people. All gift cards and E gift vouchers expire 1 year from purchase date. For more information, please see our Terms & Conditions.

All our high-quality denim is ethically sourced from Japan - most notably, from Kurabo. Click here to find out more.

Our entire operations and production are based in Melbourne, Australia. Our manufacturing partners are local artisans and experts in the industry, all in the game for at least 20 years or longer. Click here to find out more.

In an effort to remove any barriers that a physical store and fitting experience can sometimes impose, we have opted to provide an entirely digital offering.

However, we love being able to collaborate and shop with you in person, so throughout the year we usually organise Trunk Shows and Pop-Up Stores. Follow us on Instagram and subscribe to our mailing list for all the latest updates!

We certainly will! We always have a lot of new and exciting products in the works. Follow us on Instagram and subscribe to our mailing list for all the latest updates. If there is product idea or design combination you have in mind, let us know by dropping us an email!

We strongly believe that our products can be worn and enjoyed by everyone.

It is important to note, however, that our ‘Custom’ and ‘Ready to Wear’ products are geared heavily towards traditional womenswear. This means that the rise, crotch, and bust of our jeans and jackets are positioned and structured in accordance with traditional womenswear standards, which can pose an issue for some. We hope to launch our unisex and menswear collections soon. Follow us on Instagram and subscribe to our mailing list for all the latest updates!

Click here for a summary of our exchanges and refunds policy