It’s not about selling tshirts online. it’s about creating, nurturing & building your brand. In the end, it’s not your tshirt that sells but it’s your brand that gonna make a huge difference & differentiate every other competitor trying to sell products online.
Many have this misconception. Domain Name or reg is nothing to do with legal registration or legal name of your business unless or until you infringe a registered firms name directly. You can operate your domain name and legal name with different names. But your business transaction and filing of sales tax have to happen on your legal name of the business, not with the brand domain name.