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You may have noticed that women basic socks aren’t what they used to be. Think back: for a long time socks were just something you used to cover your feet. Possibly black, probably ankle-height and definitely an afterthought. Socks are now an important part of your outfit at the least, the making of an outfit at most.

Socks have become an area of diplomacy and woke-signalling – the Canadian prime minister Justin Trudeau is perhaps the biggest name to use socks in this way, choosing pointedly themed ones for public occasions. Or a telling insight into a political mind: Boris Johnson was criticised recently for not washing his lucky socks, emblazoned with a ruler of the Neo-Assyrian empire King Ashurbanipal, often enough.

Socks are such a basic item that they're easy to take for granted...and leave on the floor, shove under beds, or lose to the dryer monster. (It happens to the best of us.) But socks actually deserve mad props for keeping our wiggly and sometimes stinky feet dry, warm, and free from blisters, so in honor of National Sock Day, here's a little history of how they became a thing and some guidelines on what kind to wear and when…or not.

Until the 17th century, men basic socks were called stockings, but according to Wikipedia, the modern English word sock (first recorded in 1690, btw), evolved from the Old English socc which evolved from the Latin soccus…"a lightweight shoe worn by ancient Greek and Roman comic actors." Socks are worn on our feet (mostly) and come in various lengths, fabrics, colors, patterns, and styles, depending on their intended purpose, i.e. thick wool socks for skiing, thin wool dress socks for business, and short white socks for running. But the first socks were actually made from leather or matted animal hair – called "piloi" in 8th century BC Greece. A thousand years later in the 2nd century AD, the Romans were the first ones to sew woven fabrics together and make fitted socks ("udones").

As societies progressed, so did basketball function socks, and they were made from wool, silk, and cotton, depending on a person's economic class (nobles = silk; peasants = wool). Besides being a display of wealth, socks served an important utilitarian purpose since even nobles faced harsh conditions at times. (Indoor heating wasn't a thing until the 20th century, so keeping those piggies warm was essential…frostbite didn't care if someone was wealthy.) Peasants especially were exposed to the elements way more than we are today and needed to protect their feet from the wet and cold. (They also bathed less often, so if you think your teen's basketball socks are stinky, just imagine the funk of a 16th century pair.)

The knitting machine's arrival on the scene in 1589 was a game-changer since six pairs of football function socks could be made in the time it took to create one previously, but socks were still hand-knit alongside the machines for another couple hundred years. A tiny percentage are still made that way today. Socks were historically held up with ribbons or ties or by garters since elastic wasn't a thing yet. Until Jedediah Strut's Derby Rib machine in 1758, that is, but it was so expensive that it took almost two more centuries before more socks were held up by elastic than garters. To put it in perspective, in 1899 England, a pair of socks sold for the equivalent of $15 today…a LOT back then.

We've established that socks come in all kinds of fabric configurations and all kinds of styles, some of the common categories being: dress winter floor socks, athletic socks, hiking socks, ski socks, knee socks, tube socks, ankle socks, foot socks, boot socks, novelty socks, booties, slipper socks, tights, and pantyhose. There's no question that with the help of socks, shoes protect your feet from debris, disease, injury, and the elements. But sometimes, it's the outer world that needs to be protected from sweaty or smelly feet. To that end, businesses and venues with dress codes will usually tell you if socks are required (that would be yes 98% of the time). But what about when it's completely up to you? Socially and hygienically, are there times that you should always—or never—wear socks? (That would also be yes.)