Theory Vests first appeared on Chictopia's streetstyle gallery in Summer 2008 seen on San Francisco blogger Serafin. She styled her blue Theory second-hand vest with a gray Topshop frilly dress, yellow vintage from the 70's bag, and gray UO oxford cut-outs shoes. Since then, Theory Vests have grown in popularity as bloggers from San Francisco, Santa Barbara, and Boston have discovered them. Theory Vests are generally seen in casual, urban, and business casual style. Popular types of Theory Vests are puffer, fringed, and second-hand. Blogger's favorite colors are black and blue.
There are currently 13 streetstyle photos of bloggers wearing Theory Vests. Most recently, blogger Memosne of fafofi.blogspot.com rocked her blue Theory vest with a dark brown Hibou boots, black momo cat hat hat, and cream Club Monaco silk button up shirt.