Yes, that is an Igorot behind. This is the favorite part people take pictures of. Hmmm, can't figure out why. Hehe
This is more conservative though, it was when Igorot will wear their bahags (g-string) covering the butt and underneath is the brief. Young generations nowadays are a little bit liberal wearing the bahag like the old generations do. With the butt showing and no brief inside.
If you want to see more of these, check out Cordilleran Festivals for dates and the Incoming Panagbenga this February 25, 2012.