6 March 2024

NEW PATTERN! Meet the Thea trousers

Two models wear wide leg trousers in pink cotton and white corduroy

There's a new sewing pattern on the block, and Team Buttons is obsessed!

The Thea trousers are a pair of wide leg pants that will be on regular rotation in your wardrobe. With multiple pocket options, two hemline lengths, and a wide range of suitable fabrics to choose from, this is a pattern to sew again and again.

Read on to find more about Thea…

Model wears white corduroy cropped wide leg trousers
Back view of white corduroy cropped wide leg trousers with patch pockets
Model wears hot pink wide leg trousers
Welt pockets on back of pink trousers
Back view of wide leg hot pink trousers with welt pockets

Technical drawing of Thea wide leg trousers sewing pattern with welt pockets


These classic, wearable trousers have a wide leg that’s bang on trend and oh so comfy.

If you fancy learning new sewing skills, we will guide you through making impressive welt pockets with our step-by-step instructions and free video tutorial. Alternatively, you can replace the welts with curved patch pockets for a more casual vibe.

  • Wide leg trousers with choice of full-length or cropped hem
  • High waisted, shaped with a curved waistband and back darts
  • Zip fly and button fastening
  • Front pockets with rounded openings
  • Choice of welt pockets or curved patch pockets at the back
  • Optional belt loops

Thea wide leg trousers sewing pattern envelope


The Thea pattern includes 15 sizes - UK 6-34 / US 2-30 / EUR 34-62.

Sizes UK 6-16 and 18-34 are drafted and graded for a different set of proportions to get a better fit. Sizes 18-34 include more volume for a slightly fuller tummy, including a wider waist and deeper crotch.

The pattern is available in both printed and PDF format.

Order the printed sewing pattern and we'll send you a beautiful package in the post, with a full-colour instruction booklet. Made in the UK, our patterns are printed on durable paper which you can use again and again without it tearing or scrunching up.

Order the PDF and you'll get an email straight after purchase with a file to either print and assemble at home on A4 or Letter size paper or send to a copyshop or pattern printer to print full scale on A0. Oh and this is our first pattern with layered sizes!

Azure blue crepe wide leg trousers with welt pockets


Thea is suited to a wide range of medium-weight woven fabrics. If you want a structured shape, pick denim, corduroy, a heavier cotton twill, or wool suiting. For a more fluid silhouette, try triple crêpe (blue sample) or even linen for a lovely summer pant.

(I’ve always wanted to say “a pant” singular like they do on Next In Fashion. Apologies if that offends!)

The front pockets and optional welt pockets also need a small amount of lining. You may already have a suitable remnant in your stash, such as a cotton lawn or viscose (rayon). You could also use dedicated lining fabric such as cupro (Bemberg).

You will also need:
  • Matching thread
  • Interfacing (similar weight to your fabric)
  • 15cm (6in) closed end zip
  • 15mm (5/8in) wide button with shank
  • Sewing machine and basic tools, incl buttonhole foot and zip foot or adjustable zip foot

For the full fabric requirements, take a look at the Thea page on our online shop.

Instructional photo of sewing a zip fly


We have labelled Thea as suitable for "improvers" – in other words, either seasoned sewists or those who have some experience and are now looking to challenge themselves by learning new skills.

The trickiest aspects of making trousers like these are fitting them to your unique shape, inserting the zip fly, and sewing the optional welt pockets (remember, you can always leave these out and sew the patch pockets instead). Our instructions have won multiple awards for their user-friendliness, plus we will be sharing comprehensive tutorials over the next couple of weeks on the dedicated Thea blog page to help you with these techniques and more, so you are in safe hands!

We have had amazing feedback from our pattern testers on how these trousers come together, the style and finished fit on a range of body shapes, so we hope you will be pleased with them.

Model wears hot pink wide leg trousers
Model wears white corduroy wide leg cropped trousers

We can’t wait to see your Thea trousers! Do share your sewing process, progress and finished projects with us over on Insta tagging us in @TillyButtons and using the hashtag #SewingThea so we can find them.

We hope you love this pattern as much as we do!

Fabrics: Fabrics Galore brushed Panama in ‘sorbet pink’; Lullabee 11 wale corduroy in ‘Ivory’; Minerva heavy triple crepe in ‘Azure’
Models: Man Yee Woo and Sinead Dekker
Photographer: Jane Looker
Hair and make up: Laura Anne at The Bridal Stylists
Samples sewn by Susan Young