Upper Marlboro, Md.—Oct. 26

At the end of October plenty of people take the opportunity to put on a costume, and grand prix riders are no exception. At the Washington International Horse Show, 19 riders put on their scariest—or silliest—outfits, and grooms got in on the fun decorating their mounts for the annual costume class.

While Rene Dittmer went home with the most money—he won both the $75,000 FEI Welcome Stake aboard Corsica and then donned a beer costume to win the $40,000 Accumulator Costume Class aboard Burlington Riverland—the biggest award, that of best costume, went to Matthew Williams (Fayuri Awr) for his interpretation of Taylor Swift.

Check out photos of all the action.

Find full results here. Catch up with all the news from the Washington International here. Get full analysis from the competition in the Nov. 27 issue of The Chronicle of the Horse magazine.