I have a way too large piquet T-shirt I can't wear, but if I narrowed it, it would be fine. The size is not too long, just very wide. I don't know how I ended up with 5XL, it's sort of a mystery. I bought a few T-shirts on sale last year and this one was never taken in use. The trouble is flat felled seams in the arm-shoulder joining (oh horror). I might try a stretchy seam joining the outside in and sewing them together (if that makes sense). Any tips or things I should worry about before I start cutting?