With the pants slot existing, stuff should be put in place to have it properly be made use of. While I can imagine existing stuff will be changed over in time, I am suggesting adding a policy that any new clothing items being added that represent a shirt and pants must be split into the shirt and pants items.
Let's say someone wants to add a new uniform that is ICly a shirt and pants, under this policy, they wouldn't be allowed to add it as a singular item (as current uniforms are), they would have to submit it as separate shirt and pants items, meanwhile if someone added a new jumpsuit, for example, that would be allowed to be a singular item as it is a singular piece of clothing.
Sorry if the way I worded this sounds awkward, I was thinking how to have it make sense.