You first need to design your clothes and items and make them public, the users will vote the best ones which will then go to the auction, once you get a top Fashion designer you can enter in the Shopping game.
Almost anything that can fit into your avatar, designs can cover dresses and clothes, hair styles, and anything related to fashion and design but also scarcs, hair, eyes, etc.
In Tengaged everything is a game and all your designs will be voted by the users, if your designs are cool and users like them you will easier access to get a shop to sell your designs, the best shops will continue in the game and shop owners will get part of the benefits.
Credits to designer.
Re-coloring done by me :)