Well first of all, make sure you're measuring correctly. Here's a pretty good idea of which measurement is which: http://www.threadsintime.net/sitebui...asurements.jpg
There also might be a range of sizes to accommodate for shirring in the back, so as long as you fit in that range you should be fine.
Probably not. If the picture makes it look shiny, it probably is. But Bodyline has been pretty good about non-shiny things.