Roblox allows players to customize their look via wearing clothes that can be obtained through the Roblox catalog, which can be found here.

Each category has free in-game items for the avatar. Roblox hair, hats, heads, shirts, faces, neck, shoulders, front, back, waist, and a variety of additional accessories are all available for free.

There are a couple of reasons why making clothes is important on Roblox. As well as helping your avatar look stylish, you can also sell them in the catalog which will certainly come in handy.