No, this is not a Halloween costume, but an actual cute dress. I love when I find random cupcake items, as I did recently while browsing on Modcloth. This is the My Kinda Gallop Dress. What do you think? Here's the blurb on Modcloth:
Today, you’ve made your annual return to the countryside. Sporting the fun cupcake print of this silky pink dress, you sit down to tea in the drawing room, enjoying the view of the fields and stables outside the window. Complete with ankle-strap flats and a navy-blue cardigan, your adorable ensemble is as sweet as the sight of the sugar-white galloping horses roaming the peaceful grounds.