Merchant and Mills Thelma Sewing Pattern Mill Creations *Merchant and Mills. Thelma Boilersuit Printed Paper Sewing Pattern Merchant and Mills Thelma Sewing Pattern Mill Creations Merchant and Mills Thelma Sewing Pattern Mill Creations. A traditional workwear boiler suit 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 pattern with size ranges UK 6 18 and UK 20 28. This PDF pattern is made up of 4 A0 pages and 73 A4 pages. Fabric suggestions 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. Please note sewing patterns are final sale.