If it is a kid that is wearing the costume then it's probably because they love Elmo. If it is an adult wearing the Elmo costume then it is probably because they wanted to be silly.
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Jim played Harvey in a gorilla costume. (is that better Cindy?)
One reason a person would wear a Coach fanny pack is to carry extra stuff while shopping around town. A person may also wear a Coach fanny pack because it is a fashionable accessory.
i would wear anything i want its up to you
I would say neat casual, but some people go for the whole dress thing, so it's really up to you!
Peeta wore a "flaming" costume for the opening ceremony, a simple suit for the interview with Caesar, and the same thing Katniss wore for the actual games.