I would LOVE the ability to sort the Kids' Clothes section by girls clothes vs boys clothes.
I'm not sure how you would go about doing it though. You could have separate boards under Kids' Clothes for Boys vs Girls, but I'm not sure how you would handle neutral items. Either have a third board (Neutrals) or have the ability to check on the post that it's neutral and make a duplicate post so that appears under both Boys and Girls. Though then you'd have two posts for the same item(s), so that probably isn't a good idea.