That Rev2 Claire concept art has had me wanting a certain costume in REmake 2 and since it didn't happen RE3 now
after you beat the story, with the costume key go to the STARS office and you can unlock
for Jill to wear that allows her to take more damage, or heck give guns an accuracy boost as well(Chris being the team marksman)
Hell go crazy
Rebecca Uniform - more healing items and effectiveness
Barry Uniform - more specialty ammo, maybe a damage buff
Wesker Uniform - melee attacks and super dash
Jill Uniform - more damage, more explosive ammo, master lockpick
Brad Uniform - faster running and movement