I'm an identical twin and I know we had separate clothes - but as typical back some 25 years ago - my sister and I were dressed in the same outfit but different colours lol! Looking back on photos now it does make it easier to tell us apart in photos cuz I was always the one in purples etc and my sister was always in the yellow tones lol (not that u will have this problem!)

I think just do what u want - I think I'd be way more unorganized and prob end up with loads and loads of washing and probably clothes from one twin only left and they would have to start "borrowing" from the sibling! Although if my sister and I are anything to go by we are still doing that so good practice!!