The Tuesday, March 18 episode of The Biggest Loser is about to get a little more stylish — Project Runway god Tim Gunn will stop by The Biggest Loser for a special appearance.

Tim Gunn will help out The Bigget Loser contestants in the makeover episode — contestants will get new duds and hairstyles. Check out The Biggest Loser on Tuesday at 8 PM (ET/PT).