As promised, me and Sanji came up with the designs of the mares dating our son Noah. First up, a favorite of mine, Sanji's, and possibly every brony on the planet: Rainbow Dash! Noah calls her Dashie, considering she was his closest friend out of the five mares he dates, as well as his mentor in flying. He even has the capability to keep up with her at top speed, if not surpass her now. She even taught him how to do a Sonic boom of his own. What it does, NO ONE KNOWS. She was the first to date Noah and the first to join his harem.
Anyway, to the outfit! What we see here is a natural outfit Dashie wears from time to time: a trademark set of flight goggles on her head, a black flight suit with her cutie mark on the hips, and a pair of black fingerless gloves. The only thing not visible at the moment is a pair of blue sneakers with rainbow-colored laces that she wears as well as a ripped Wonderbolt jacket she normally wears as a cape. In our world, she's the youngest member of the Wonderbolts, as well as the youngest out of the Mane 6 at the age of 18. She is also the youngest out of all the mares in Noah's harem.
And of course, considering that Dashie is a tomboy, she is the only one that does not wear anything frilly and cute. She is normally found either wearing a loose blue t-shirt with her cutie mark across the chest and black workout shorts with the same sneakers, or bandages wrapped around her chest and a pair of black boxers that belong to Noah. The Noroi seal is located above her tail.
Rainbow Dash (c) Lauren Faust, My Little Pony: Friendship Is Magic, Hasbro, and The Hub Network