If you wear a lot of makeup and "sexy" clothing to bars when that's not something you'd do normally, you're faking it. You're either going to have to keep up the mask, which I don't recommend, or risk facing rejection when they realize that you're not who you initially presented yourself to be.
Will a girl who's dressed sexy attract more guys in a club/bar/party scenario? Maybe, depending on the atmosphere and general purpose of the people there. But ultimately, it's about quality vs quantity. If all you want is a ton of men interested in you for a day or week or some short period of time, sure, sexy is probably the most effective way. If you're more interested in building a long term relationship, it's better to be yourself.
In other words, if you dress like you want to have a one night stand, you're going to attract guys who want just that. If you dress how you usually would, it may take longer, but those who approach you will be more likely to be interested in you, especially if there's a high number of women dressed sexy.
Match.com has been running advertisements lately that you're more likely to meet the person you marry online than in a bar and club and party. I don't know if that's accurate or not, but it wouldn't surprise me. Bars, etc, aren't really meant for finding a lifelong partner. It can happen, but I'd guess that it's probably not that common. Speed dating is done for the purpose of getting dates, but it's so short that you don't really have the time to learn much about the person. Plus, you don't really know what they're there for; some people could be honestly looking for a long term partner, some could just be looking for a fun date, and some could be looking only for sex. Online, at least, there tends to be more disclosure; it's usually listed what they're looking for, as well as some information. Of course, it could be lies, but you run that risk anyway.
In general though, for what you've described, it sounds like being friends first really would be the best idea.
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