Once I was certain I would be able to make the gummy heart in my hotel room at DragonCon, I turned to the outfit itself. At first glance, it looks like Daenerys wears the same outfit throughout the middle of the first season, but on closer inspection, it's the same leather skirt, leggings, and boots, but her top and accessories change ever so slightly from episode to episode. I focused on her outfit during the horse heart scene specifically, while using screenshots of her other similar outfits as additional reference.
In the interest of comfort walking around the crowded and hot DragonCon hotels, and in the interest of saving room in my suitcase, I decided skip the leggings and boots that Dany wears throughout the season, in favor of flat, lace-up leather sandals, identical to those worn by other Dothraki women during season 1.
For the skirt, after looking at every scene and every angle I could, and considering the realities of a culture that lives on horseback, I decided to go with two distinct layers, both in faux suede. The underlayer is a short, off-white skirt, split at the sides all the way to the waistband, while the overskirt is sage green, split to the waistband at the front and back, with a few inches of overlap between the two panels in the front. Splitting the skirts this way means that they could be worn on horseback without having to ride side-saddle, and behave the way we see Daenerys's skirts behave in the show. I made the overskirt knee-length in front, as in the show, but longer (nearly floor-length) in back, because of my lack of boots.