Yes, but the sweater would have to be disassembled and reassembled. Kindly book your slot with an online tailor in London. They will do pickup and deliver to your doorstep without any single charge. Original Source: https://www.quora.com/Is-it-possible-for-an-XL-sweatshirt-to-be-altered-to-an-M/answer/Hello-Laundry