How can you make your ownclothes in roblox

Without builders club...
T-shirts no sale

With Builders club
T-shirts
Trousers
Shirts
Sale

and for the t-shirt you just upload a pic
Trousers/shirt you download a template witch you open in paint paint.net things like that
you would find the download in shirts page in ur inventory on the create option

Hope this helps
PS:better read this it took a while to make