Dry when naked, wet as soon as clothes on! Help!

[Olaffles]

DD is now 2.3, potty trained herself just before she was 2 by copying her big sister. I thought it was too good to be true, and it is! At horn she is 100% reliable but as soon as she has clothes on (have tried just pants, just leggings, just loose trousers) she seems to not know when she needs to go! If she has a skirt or dress on she can still do it, but now it's winter it's too cold for that without tights. Not sure how to progress really so wondered if anyone had any tips?