Need a tiny bit of help with an OC

[Nightmare Saturn 815]

So, there's an RP that I'm joining based on Equestria Girls, and I need a little help making a design for my OC, Rainbow Kaboom in EG... 

Here's what I have for ideas:

I was think of her having one of those red school jackets with the white sleeves, but the red part is rainbow colored, she can keep her bracelets and she'd have a heart necklace (Also her cutie mark is a pin on her jacket) her hoof colors are incorporated into her clothes, her back hooves are her sneakers and the front ones are finger-less gloves... 

 

Help would be appreciated, as I have no clue what to do...

 

Thanks~ Saturn Ring