https://www.gamespot.com/articles/shadow-of-the-tomb-raider-includes-classic-tomb-ra/1100-6461076/

Like Rise of the Tomb Raider before it, September's Shadow of the Tomb Raider will include classic outfits for Lara Croft based on how she looked in old Tomb Raider gamers.

There are at least three skins, the first of which is her standard Tomb Raider II look featuring her teal tanktop, brown shorts, and pistols holsters. Another skin is for Lara's look in Tomb Raider: Angel of Darkness where she wore a black tank and shorts. The third is Lara in a bomber jacket from Tomb Raider II. All of them are polygonal and look very dated, as they should. Square Enix has confirmed their existence in Shadow of the Tomb Raider, but has not released any images or detailed how you can unlock them in the game.