It’s Marc Jacobs’ 49th birthday today! Here at Fashionista, we are not bashful about our love for both Marc the man and Marc the designer. A few years ago, as he started to shed pounds (and a rather frumpy personal style), skirts became his sartorial signature–maybe to show off his newly ripped legs? We don’t know for sure, but it’s certainly endearing.

From tartan kilts to tweeds and Prada, check out Marc and his best skirts.

Photos: Getty, except where otherwise noted.