Fashion designer Emma Sandham-King created the garment to celebrate horse racing's 2016 Cheltenham Festival, which starts tomorrow.
Sandham-King said: "Creating the world's first tweed suit for a horse has been one of the biggest challenges that I have faced in my career as a designer.
"Some models can be real divas, but veteran racing horse Morestead was calm and a pleasure to work with."
"Tweed is undergoing a massive revival and this year's Cheltenham Festival will see the most tweed worn since the 1960s," she added.
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Sandham-King was an apprentice of the late Alexander McQueen, the acclaimed London-born designer.
Sandham-King and her team of seamstresses and tailors spent four weeks creating the suit using more than 18 metres of tweed, the BBC reported.
The suit, modelled by race horse Morestead and champion jockey Sir Tony McCoy, required 10 times as much fabric as an equivalent human suit.
The horse-sized garment was commissioned by bookmakers William Hill.
The Cheltenham Festival is a meeting in the National Hunt racing calendar in the United Kingdom.