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Samantha Ronson got carried away at Fashion Week in New York City ... by herself.

The DJ toted her own garment bag -- wonder what's inside! You didn't expect Sam to wear that Cosby sweater during Fashion Week, did you? ... Well, actually, we wouldn't have been surprised. Sam has always had her own style!

Ronson was on hand to DJ her sister Charlotte Ronson's fashion show. She almost didn't make it! Earlier, she'd been at the U.S. Open semi-finals, where she Tweeted, "Come on Federer. wrap this up- i gotta go dj ... "

And how did Sam sum up Fashion Week? "Um, is it Halloween in NYC? #fashionweek," she wrote.

Samantha Ronson DJ New York Mercedes Benz Fashion Week