Why do women wear revealing clothes for an electric dance concert?

Is it related to the heat that it gets generated at the concerts?

Context:

Most of the time when there's an event I see some women only having a bra on, others have some type of swimsuit or a one piece swimsuit (or wearing clothes similar to it).

They seem to be happy like that or they don't care of what people think about their outfit. But what I wonder if they're ok during the cold times (some of the days these concerts occur are when temperatures are on the 50 - 60s). And they don't seem to mind everybody looking at her (specially guys looking at women with revealing clothes).

It's curious.

Why do women wear revealing clothes for an electric dance concert?
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