I can't say anything about the costumes. They wore the same uniforms as they did in the original TV series. However, I can tell you that if you weren't a fan of the original series or if you never saw it, don't worry, you will still enjoy this movie immensely!
My friend and I saw it in a half-filled movie theatre but that was probably because 9 of the 18 screens at the movie theatre were showing it 15-30 minutes apart. More than convenient. It was really fun and I would see it again! If you haven't seen it yet, I highly encourage you to go and check it out
I am sewing today...so there will be more about that later!
p.s. The pic above is courtesy of screen.olgy.com