Originally Posted by A Guy from Shanghai
I am no tailor...but usually there is little/no extra material in the crotch area to be let out.
It's not necessarily a question of letting the fabric out. It could involve opening the seams and reconnecting them at a lower point, cutting off the excess fabric. As a comparison, I know that tailors can alter the armpits on a jacket by lowering them, but they can't raise them, because there would be no fabric to work with. It might be counter-intuitive but if you ponder it for a moment it makes sense. My fear is that with trousers, lowering the crotch would make them too tight around the seat... but my knowledge doesn't extend that far... anyone know if that's true?