I need to furnish 4 year old with a painting overall for Kindergarten. Has to have elasticated cuffs, they advise a man's shirt with sleeves cut to length. Except DH has no shirts he is willing to part with and I'm not going to buy a shirt just to mangle it. Can't be a plastic one which is all they seem to sell. Is there any reason I shouldn't buy a cheap, long sleeved (woman's) t-shirt and just shorten the arms? And is that easy to do? I'm thinking cut sleeve, fold back enough to put elastic in and sew around. Why would they specify a man's shirt?