The only popular fashion (if you can even call it that) I've ever observed with any consistency is "hoodie" and "graphic tee". More rare, but worth noting, is shorts-when-its-pants-weather. The lack of dress-code just translated into whatever a person would be wearing if they had stayed at home.
I wouldn't notice a person's socks unless they asked me to.
Fashion leather "work boots" or jump boots (e.g. Red Wing, Danner). Oddball, usually lightweight, sneakers. Selvedge jeans with the cuff roll (maybe hipster, maybe tech hipster—need context and other clothing cues to tell the difference). Expensive hiking & bouldering/rock-climbing brands, for shoes, boots, pants, and jackets, especially (meanwhile, normal fans of hiking who aren't doing a lot of very long hikes just wear shit from Costco). Merino wool everything. $100+ hoodies.
I just googled based on your comment. I assumed this was just socks with programming jokes written on them, but appearently it is actually a term for knee-high socks https://knowyourmeme.com/memes/programming-socks
Edit: i didn't realize this was a term for anime-ish knee high socks. Regardless i think my point still stands.