This is a running joke actually which I discovered the last time I was in Glasgow. The students all like to 'decorate" the Duke of Wellington late at night. Usually the authorities remove it the next morning but I guess they felt bad for the Duke in that it was raining and he needed a bit of protection. He sports a poster cape and a traffic cone, and his horse wears a Scotland tourist scarf. Somebody should have put an umbrella in his hand.
I checked the Duke's wardrobe every time we were in the area, which was almost every day passing through, but there were no more wardrobe changes save a crummy seagull on his head.
See what the Duke was wearing four years ago.
http://www.pbase.com/sveetzel/image/22688642