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Wait until you find how few customers give a crap.
Yeah, it is kind of a niche customerbase.
Doubt you will find many trans in one particular location to warrant a store. And enough clothing in those uncommon sizes to put on your shelves.
Also, are measurements not just based upon the amount of centimetres that go around your body parts? Why would there be 2 different measurements for men and women?
Clothing measurements aren't even consistent between countries, there's effectively no standard. If where you live measurements are based on something sensible, that's pretty lucky.
The XS/S/M/L/XL sizes of course differ for men vs women, and EU sizes which to me have always seemed like an arbitrary number do too. But usually individual clothing manufacturers provide precise measurements to translate into the generic sizes, because of course that's not consistent either. It's a complete shitshow, but ultimately gender size conversions aren't going to help you with the manufacturer differences anyway. But those really should be more easily available inside clothing stores
Not even two the same size pair of pants from the same company are the same size. Unless they're giving the actual measurements I've never found clothing sizes to have any meaning whatsoever.