Enlarging a sleeve is something I have to do all the time! I don’t have the pencil arms patterns seem to think are normal, so I am constantly redoing the sleeves. I helps that I love a gathered sleeve head, that makes it even easier to alter. I’m working on a project that requires a rather fluffy sleeve. Having found no such pattern, I decided to make my own using an existing pattern as a base to alter to match. Note that there is some loft in the sleeve head – I’m interpreting that to be gathering. The forearm of the sleeve is also much wider than the bicep, so…