Target Application: Select the trl.exe in the Folder where TRLegend is installed. It is most likely somewhere in C:\ Program Files\ Crystal Dynamics\ Tomb Raider Legend folder, unless you installed the game elsewhere.
Select PACKAGE MODE: Click on the Folder button and browse for the Lara Amazon.tpf and double click it.
Mark the Lara Amazon Package Name and click on RUN… In Game select the Default Outfit.