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Billy Slim Unisex Sweatpants Sewing Pattern, Monsterfabriken



Billy is a pair of slim sweatpants with elasticated waist. The pants sits on the hip and have a slightly lowered crotch. The leg is ended with a cuff. The pattern is made for men but works well for women aswell.

This pattern is not for beginners as there are no seam allowances included in the pattern. It is a great choice for those with experience in dressmaking, adjusting patterns or pattern cutting.

The pattern includes general sewing instrucions which are very clear, but there are no illustrations making it unsuitable for beginners, but refreshing for those more experiences. Detailed instructions are avaliable as a download with the code included in the pattern. 

Difficulty level: 1 of 5   

Fabric Suggestions: The pattern is designed for stretch fabrics. 

Fabric Requirements & Sizing: Please see the image in the gallery for information. 

A Note about Monsterfabriken Patterns: 

Monsterfabriken are essentially pattern makers, whose main focus is the fit. Their aim is to make patterns that are easy to follow and alter. Their sewing patterns are plain but detailed so that you can easily adjust them to your body and your liking. Monsterfabriken patterns do not have seam allowances included. This could seem daunting, but actually it can be really beneifcial if you are adjusting patterns or using the pattern pieces as a block.




Delivery Charges

FREE delivery on all orders within the UK over £49!

Standard Delivery UK – £3.95

Express Delivery UK – £10.95

Next day delivery for orders placed before 1pm Monday – Thursday. Orders received on Friday before 1pm will arrive with you on Monday.  Orders placed over the weekend will be sent on Monday to arrive on Tuesday.  Please bear in mind that we do not open on Bank Holidays. This service is trackable, and will require a signature.

Europe – £7.25

Royal Mail International Standard Shipping – 5 – 14 working days depending on the location. For urgent European orders please contact us first. Not trackable.

Rest of the World

Small Parcels Less than 0.49kg £9 (approx 1 or 2 kits)
Medium Parcels 0.5 to 0.99kg £15
Large Parcels 1 to 1.99kg £30
Heavy Parcels 2kg + £65+

Royal Mail International Standard Shipping – 5 – 14 working days depending on the location. For urgent International orders please contact us first. Not trackable.

Please review to our International Sales Policy before placing an order.


If you are placing a large order and would like your package to have insurance, please contact us before ordering for a quote.  The cost will depend on the package and the location.

Sewing Machine Delivery

Sewing machine delivery is FREE within the UK, excluding Highlands and Islands.
The courier surcharge is approximately £25.
Unfortunately we do not ship sewing machines internationally.

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