Brandi Glanville -- WAAAASTED ... and My Clothes are Falling Off!

You ever hit the bars so hard, you can't walk straight, you show everyone your ass, and your boobs fall out of your dress?

Yeah ... that happened to Brandi Glanville last night.

The "Real Housewives of Beverly Hills" star was stumbling around West Hollywood after what appeared to be a high-end bar crawl that started at The Abbey ... moved to Dan Tana's ... and ended at the London Hotel.

Good news -- it appears she took cabs everywhere.