Is this a nod to International Women's Day?

Justin Theroux wore either a body-con tube skirt or a long tunic to the Louis Vuitton show in Paris today ... and btw, where's Jennifer Aniston?!

Chances are, Jen would love Justin's edgy look -- it gives her a bit of a cool factor since she'll never have it on her own, wearing boot-cut jeans and raffia platform wedges.

Anyway, Justin rocked a whole buncha black -- his signature color -- in a sleek, LV style, and some sort of knee-length skirt/tunic over his slim black jeans. He posed with the beautiful Michelle Williams, who he knows from NYC. She sported a strapless leather dress and ankle boots. Michelle was the first to do the short platinum 'do and frankly, she does it the best!