Valve had a Tomb Raider themed contest for Team Fortress 2 last month and one of the winning (and by far the funniest) contribution was a pair of Lara's shorts that can be used by Heavy and Sniper. This is, of course, what Valve more or less asked for when announcing the contest by writing:
"All of the Tomb Raider games are fair game, so if you've been waiting for your chance to put the heavy in short shorts, this is it. (Please don't do this.)"
Now they're here (click the link for more contributions), and can of course be downloaded via Steam.