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Sheffield City Centre is strictly top hat and tails with black shoes at the weekend, buttonhole roses and/or bow ties are also expected at many of the finer establishments, and its very polite to doff your topper at the door Concierge, as well as tipping them, upon entering any licensed premises...

http://www.antiquemapsandprints.com/scansj/j-20704.jpg
this is the usual look for men

I'll not be visiting your establishments then :P

If you dress like that he will give you free beer though ;)

If you're going to be wearing a jacket then make sure that it doesn't have a hood, otherwise they might not let you in unless you pay to use their cloakroom.