When creating an R15 character the hat accessory doesnt fit

When uploading an R15 character i want the hat accessory to fit

The hat doesnt scale and im not sure how im supposed to scale it.

image (104)

image (105)

It seems to work better if i upload the character as Rthro but i still cant scale the size.

So every time i upload a character as R15 the Hat accessory will be massive when picked up or put on in the avatar preview. Hair works and the layered clothing seems to work. Am i missing something? Is there a way to scale up and down hats?