I would only caution you that you should try it on immediately, so they can make a substitution or do some tailoring if it doesn't fit. Supposedly they have a small supply of spares onboard and a tailor on board who can make alterations if needed. I made the mistake of waiting until just before dinner on formal night to try the tux on, and found that they'd given me pants that were way too large. My wife had a few pins and we were able to pin up the cuffs, but the waist was way off and I felt like I was wearing clown pants.