Karrueche Tran really put her ass on the line for dinner at Catch.

Karrueche strolled into the WeHo hot spot wearing completely sheer pants with just a thong underneath. Other patrons might have hated to see her go, but we're guessing they loved watching her leave ... based on the crowd's reaction outside the restaurant. 

That old "no shirt, no shoes, no service" rule might need to be updated if KT keeps up these wardrobe choices.

Or not. As you can see -- NO ONE was complaining.

BOOTYLICIOUS
TMZ.com