pants!:Oh.. wetsuits shrink, but it's not irreversible. It's just the nature of nylon to shrink when it dries out.
Before you go on your trip, if you remember to give the suit a good soaking and stretching (putting it on and getting in the shower is goofy but works) a few days prior, it's MUCH more comfy to don when you're ready to dive.
LOL!
I thought the reference was to the expanding diver. Cotton must dry out too, cause I have a whole closet full of...
Seriously though, sounds like you travel overseas enough to know what a PITA luggage can be, particularly these days - balance traveling lite with the value added for your trip. I don't take stuff like fins and regulators due to bulk and weight, but I would like to have my own mask and wetsuit for comfort.
As far as wetuits:
I think some people have the tendency to buy too snug to minimize flushing - if it is a real chore to get on, then it might be too tight for you.
If you are an off-the-shelf fit, order online - the charts are pretty accurate and the thin suits stretch enough to make a near fit comfortable. As somebody mentioned, the suits these days seem a lot 'stretchier' than they used to be (new formulations, mfg processes, etc) and some suits are made with that as a key feature. A few manufacturers, even have variants for short and tall fits (Body Glove, Bare - I bought Body Glove 4/3 mil online to use seasonally in a size XL Short when the LDS couldn't fit me off the shelf: Lg wasn't big enough and the XL body was too long). A 2 or 3 mil suit an be had online for about $100 and a one-piece (surf suit) travels easy. At that price I wouldn't stress too much. If it doesn't fit quite right, you can recoup half your expense by selling it on ebay and get a different one for the next trip.
If you are a hard fit, all the more reason to buy before you go. Good custom online outfitters usually have a fit warranty (send it back for re-cut if it does not fit) but you pay a bit more. If you go to a LDS to get fitted, then buy there if they find you a match. The sales girl that fitted me saw the body issue and actually suggested I check out the online alternatives.