About the whole Stormtrooper disguise thing, they could've packed the clothes up reeeeal tight and shoved them in Chewie's bandolier pouch. I'd accept that if the pouch wasn't obviously empty the whole time. Or maybe it's a Bag of Holding like you see in D&D.
The whole point of bringing that up is that I think it's not necessary to have every single second of the movie explained in order to enjoy the movie. There are times when you have to say "It's just a movie" and forget about it.