Custom fit (tailored) shirts business idea

I have an idea of starting a website selling custom fit shirts. People will choose the fabric, buttons, other customisations etc. and enter their measurements. I'm just looking for advice on what to do next. I know where to get the fabric and the tailors to make them.

Any advice on the next step? I currently live in a country where tailoring and fabric is fairly cheap so cost won't be much of a problem. Any advice is appreciated

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