never saw any sexy knickers when i was there last week - maybe a few of the guys saw a few pairs!
reckon you should stick with good old british belly warmers.....
unless you go to Sofia there is nothing other than ski gear and a few jeans shops in pamps.
you will be fine in your thick thermals, no one sees them - or at least no one saw mine, just make sure they are good ones, i took two pair and the Damart were the best for keeping the cold out, not very sexy but did the job.