I do have a tux jacket, and it fits well, but I'm curently on a weight loss program, so within a few months, I will hopefully be smaller (would not order the jacket until that time).

Do finer department stores sell argyle "type" jackets? If I were to go in and get measures, if I told them I'm ordering a jacket over the internet, and I have a choice between regular, long, etc., would they have the knowledge to tell me what I need, or do I just geuss?

This doesn't seem to be an easy task when you can't just go try it on.