You can create awesome clothes for your avatar! To sell your clothing, you will need to create a classic clothing item first. Clothing items cannot be sold for free, the minimum amount for Shirts/Pants is 5 Robux and for T-Shirts is 2 Robux.
If you need help in creating clothing, check out the Creator Documentation article on Classic Clothing.
Robux earned from selling clothes and other avatar items are held in pending status for up to 30 days being released for you to use. This pending status is called escrow. When this holding period is over, the Robux will appear in your Robux total. You can check your Pending Robux by viewing My Transactions.
Clothing: T-Shirts, Shirts, and Pants