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Thelma Boilersuit (Sizes UK 6 - 18) - Merchant & Mills Patterns


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A traditional workwear boilersuit with a gentler feminine fit. Thelma is a wardrobe masterpiece, loose enough to fit all shapes and can be interpreted in many different types of cloths, so make it your own.

Thelma will take time to put together, but make it well and wear it absolutely everywhere. Skill level – experienced.

This is a multi-size paper pattern including sizes 6 – 18. (Also available in sizes 20-28.)

All seam allowances are 1.5cm unless stated otherwise and are included in the pattern.  See the photos for the size chart and fabric requirements. 

We would suggest using the following fabrics – medium weight wovens such as sanded twill, 5 – 8oz denims, yard dyed linens with some stability, and cotton poplin.

If you are an experienced sewer you could try tencel, tencel/linen, corduroy, more floppy linens, prints and checks

Pattern Errata -Front leg (4) it says on the pattern piece ‘cut here for right side’ should say ‘left’. However the instructions are correct.

The tack on the under arm sleeve (at the cuff) the sizing is the wrong way round.

You will need:

16 x 14-18mm Buttons

2 X matching thread

70cm Interfacing

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