Ah! In which case, it's only pureblood aristocrats who are firmly in the 'pants-free' camp, and as a half-blood Snape is free to wear pants as the whim takes him. Fact!
Speculation about undies is good. But speculations about trousers is also good. For a while, in Doctor Who fandom, I was infamous as the girl who asked the show's costume designer whether the doctor's trousers fastened with a button fly or a zip fly. (It was a HOT TOPIC amongst those of us who liked a bit of NC17 Doctor/Rose goodness. I feel no shame. For the record, they zipped :D)
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Speculation about undies is good. But speculations about trousers is also good. For a while, in Doctor Who fandom, I was infamous as the girl who asked the show's costume designer whether the doctor's trousers fastened with a button fly or a zip fly. (It was a HOT TOPIC amongst those of us who liked a bit of NC17 Doctor/Rose goodness. I feel no shame. For the record, they zipped :D)