Oxxford's 57th Street store makes sleeve buttonholes well, in my experience. However, since I have been somewhat disappointed with their other on-site alterations in the past (as opposed to the garment that comes out of the Chicago factory, which is a thing of great beauty) I have usually taken my new Oxxford suits to Senol, on East 60th St., who does a very good alterations job, and also left it to him to do the button holes. He charges about $100 for eight sleeve buttons. I have it on good authority that the current alterations man at the 57th Street store is very good. They will work on Oxxford garments that people bring in, although depending on what needs to be done, they will charge for it.