Kylo still has a disturbing case of hero worship for one of his grandparents, it just happens to be Padmé. He runs away to Naboo and there he meets his relatives who take him in and teach him all about his grandma and the amazing fashion of Naboo

+He's small enough when he gets there that he can wear Padmé's actual old dresses. He's heartbroken when he grows out of them.
+He wants to live up to all the ideals of Padmé, so he turns into a super fierce defender of the New Republic, democracy and anti militarism.
+He's still super weird and rather scary, just better dressed and on the right side.
+His own dresses are all designed to look like they're difficult to move in but they have some kind of clever design that make them great for fighting in without having to destroy them (layers that can be removed quickly, skirts that can be torn off without damaging the clothes too much.
+The general despair of his parents and uncle. Like, couldn't the kid have a normal interest, like lace making.
++He actually does make all his own lace.

If you want to put a ship in there go for it, I just want the focus to be Kylo's intense relationship with super elaborate clothes.