Start Texmod.exe
Make sure you are in the Package Mode
Click in the Target Application the Browse button and select the path to your tra.exe file
In the Select Packages part there is a small Browse button to the right, click that
Select the file tra_neonude.tpf
A package TRA_NEONUDE should appear on the left side
Click on that name
Click the Run button
In the game, you must select Replay Level and select from the outfits Wetsuit
Click Start game and enjoy the view

Download Tomb Raider : Anniversary [nude patch]