Hawaii clothing store
If you are going to be conducting your business in Hawaii, it would probably suit you best to register the company in Hawaii. As a Canadian citizen, you may open a U.S. company without being a U.S. resident, as long as you maintain a Registered Agent in the state of Hawaii.
Please be advised to sell products such as clothing in a retail store, you will also need to obtain a Hawaii Sales Tax Vendor ID Number to collect sales tax on your Hawaiian sales.
I hope you have found this answer to be helpful.