I want to buy my own cloth to make finished products and sell four-piece sets online.

As long as you don't use patented designs and trademarks of other brands, it won't constitute infringement.

There are many places to check when purchasing fabrics yourself, such as materials, printing, yarn count density, etc.

Sales channels, Taobao JD.COM is still offline, and SKU

If it is online, you need component operation and customer service team.

I hope I can help you temporarily.