Hello Peaches, welcome to the Utherverse.
Yes, you can wear clothes but limited to those attributed to the basic users, which are a good selection anyway.
From the game window, just press Customize to change your appearance and the clothes.
You will not be able to select any underwear, nor tatoos or piercing. These are options for Vips.
The instructions about the game, you can find in any Guide/Leader/Protector personal profile.
And when you are in, just look for a volunteer (Friends/Search/Staff) Guide or Leader and we will be glad to clarify all your doubts
Ciao!
Dubhe
RLC Guide