There's only one chunk of costuming that I found fug-worthy (plus one strange piece, and I'll get to that in a sec). The look that I most disliked, featured in some of the movie's publicity (see below), was mostly confined to the song "You're My Love."
Check it: Salman has a rapper with giant brass knuckles painted on his pants, they stuck Govinda in a scaled-down version (who thinks this photo was photoshopped? He looks the same size as [but less buff than] Salman), and Lara is wearing shiny roman blinds as pants. Everything reeks of a dark corner of Kevin Federline's closet.
(Pictures courtesy of the official site.)
Here's the thing: I assume that these clothes are supposed to be ridiculous. So bravo, costume designers. But I maintain that I can appreciate your aesthetic and its effects - maybe even admire them in a grudging tip of the hat, "touché" sort of way - without actually liking them. So I draw that distinction and throw some more photos into the mix. The guy in the brown, orange, and white ski vest with a white bandanna looped through his jeans particularly caught my attention.
Lara also has a furry white fedora, but I forgot to get a picture.
The other standout was this itty-bitty vest thing. Lara Dutta has never struck me one way or the other in movies, but here I found her quite lovely except when she was stuck in pint-sized bleachy denim.
Update: Ohhhhh! Now I get it - they're trying to be Hard Kaur!
She's even got a vest like Lara's.