Similar to many other superhero costumes, the Batsuit's basic foundation is a tight bodysuit. In early depictions, contrasting briefs were worn over a one-piece suit, similar to the garb of early 20th-century circus performers and strongmen. "Batman" #1 (June 1940) revealed that there is a bulletproof vest sewn into the costume. Modern depictions of Batman's suit do not incorporate contrasting briefs, and the character's suit consists of pants without a color change. The Batsuit is also no longer portrayed as a one-piece suit, as the top and pants are separate pieces.