(cracking up at the breathing room thing....)
Fashion Bug also has a grat selection of thongs in regular and plus sizes, and gorgeous undies in regular styles as well. They usually have the buy 3, get 3 sales there as well. Thongs and T-backs are the name of the ones with the thicker strip of fabric down the center, and g-strings are the name for the ones with the thinner "string" piece of elastic. (my old roomate had a sister who was a stripper.)
I personally have tried to wear them and get used to them...and I just can't do it-when I do wear them it is only if I am going to be taking them off sometime within the next hour or so...

and on those occasions, I have found the soft stretchy lace T-backs the most comfortable for me.
Aphil