Gender restricted Mog station gear, unlike "generic" gear actually looks very different based upon the gender. You pay your $$$ and get the look you want with the knowledge that it is restricted to that character and that gender.

If you then decide to change genders then sorry - if you want the vanity items also you have to cough up the extra. Just like if you went through it in RL and ball gowns or tuxedos cost a lot.