Trouser fitting issues.
I'm trying to sew a pair of trousers for my son. The photos are from the first fitting. My son has gained a bit of weight from waist 36 to 36 5/8 and seat 41 3/8 to 42 1/2 inch.
I'm unsure whether simply letting out the side seams - for the tight waist - will provide sufficient room for the prominent seat, or if I need to adjust the seat angle or make additional alterations.
I'd be very grateful for any advice or suggestions.



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Thank you very much for your reply and your advice.
I remembered Rory’s video “Common Alterations in Trousers” in pattern drafting for bespoke menswear and came to the same conclusion as you mentioned. I'll give it a try by letting out the side seams and letting out the fork.