Rin's shop is simply called "Rin's", as she's uncreative with the title. The shop is situated where there would be plenty of foot traffic for everyone to see. Rin will take on any commissions that anyone asks of her, and she'll personally design clothing if people want that. She is not picky with customers, and can work with both male and female clients. She'll also mend clothing if need be.

I forgot to add that she has her husband's cardboard cut out with her there that she takes back and forth from her inn room to the tailor shop so anyone that does business with her will get to see it.