In Hong Kong, Chinese men from the mainland are easy to spot.
It isn't because of the mainlanders' physical differences, although Northern Chinese stand out from the shorter, fairer-skinned Hong Kongers (mostly Southerners originating from Guangdong) like a cockroach on a wedding cake.
And it isn't because of the different dialects; you don't even need to be within earshot to pick out the mainlander from the crowd. All you need is a keen eye for dress habits.
Here a few observations you can use to help you play the game "is he a mainlander or not?":
• wool or polyester dress pants; many times grey;
• patterned polo or golf shirt; high likelihood it will have a crocodile logo;
• black belt with mobile phone pouch clipped to one side;
• black and pointy (or squared-toed) loafers ... always loafers;
• white socks.
That's not to say Hong Kong men don't dress this way as well (polo shirts are common, for example, but a Hong Konger would probably wear it with jeans and a pair of cross-trainers), but it's the combination of two or more that's the tell-tale sign.
I wouldn't go so far as to call it a dress code, but I've seen enough mainlanders decked out that way to distinguish it as an element of the motherland's fashion consciousness.
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