Russell Westbrook Dominates '90s Party ... Nice Overalls, Bro

If Will Smith could pull it off, why not Russell Westbrook ... right?

Russ stole the show at Dorell Wright's '90s-themed charity event in L.A. this weekend -- rocking the overalls, no shirt, gold chain, pink hat and glasses look ... with an ugly yellow jacket to match.

TLC WOULD APPROVE!

A bunch of other NBA stars hit up the party too -- including James Harden (lame outfit), Nick Young (decent outfit) and Gilbert Arenas (weird zipper outfit).

The event raised more than $10,000 for the D Wright Way Foundation which helps underprivileged youth.

Check out the pics ... and be pissed you tossed out your Cross Colours.