There is no inventory system in the current version (1-4 weapons) (T for helmet / weapon lights i think), clothing can be put on at specific interactive combat lockers or in crew quarter rooms (interactive lockers), at the HUB you have two interactive lockers to use one in the room where you wake up, another near the medical lab (when you head out to the werewolf hideout) you can change outfits there.is there any inventory system? how do you put ON clothes?
If your in main story not the HUB you have to find the clothing scattered out across the maps, clothing picked up can be changed at lockers in crew rooms (that have E interact) or the combat lockers that have E interact as well.
Honestly... its not worth the clothing because they get torn off pretty quick regardless be it wolf or human.
Also, the Rebreather in the water section is not selectable as an item to wear clothing wise (even though it looks hell a sexy).
Once you get it you only have it for that section, after that you go back to normal clothes.