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Tremendously slowed down so you can try to hack at the question; How did Rarity do that!?

Apparently you can slip shorts on over your head. The only plausible explanation for how this all happened IMO is:
0. Outfit is turned inside-out
1. It's thrown on in such a way that impact turns it right-side out.
2. With enough speed and force, Rainbow's body was sent through one of the shorts' leg-holes.
3. As Rainbow is forced into a crouch from the force of impact, her skirt and short-legging-things are launched to the floor. Thanks Rarity, for pants'ing your friend.
4. While the shirt slips on perfectly over the top as you normally put a shirt on, the new shorts Rarity is launching go all the way to the floor, under her feet, where her foot is slipped through the so-far-unused leg hole, then
5. With a recoiling motion, the shorts are pulled up in the last frame we see Rarity's hands near Dash's feet.

Well, that's the best explanation I got Xp

Upvotes at import: 48 | Stars at import: 33
Posted previously at: 2015-09-29T12:19:20 | Posted previously by: Cirrus Light