These are the knitted beer mug socks crafted by Serbian artist Vicky Djokic and available for sale through her Etsy shop. They're available in whole sizes from women's 5 (EU 35) to men's 14 (EU 47) and cost $49 a pair. Not the cheapest socks, but definitely a pair that will get you noticed at Octoberfest, and not for trying to nonchalantly puke without anyone noticing for once. Jesus, get it together.
Keep going for a couple more shots.
Thanks to Ashley G, who agrees these are a must-have accessory for your lederhosen.