Oh, now as you say it... :-!

/\  not based on personal knowledge yet but I'm looking at Columbiaknit, supposedly the best going ..... make for Orvis, Archival et al.

Yeah, my everyday sock back in my school daze was the striped athletic sock. Hard to find these days.

^ Really? Okay, thanks.

Chums,

I'm not sure the 70's trad was that much different from the 80's.  By 80's there was a hint of irony.  Maybe fewer turtlenecks.

/\  I like that drawring Bop ... dude's a hybrid of a few things as you say, and I don't know if I've ever seen that exact ensemble in real life, but it's cool, got some good Lords of Dogtown vibe to it .....

with a haircut and a pair of canvas sneakers instead of Incontinence pants, your guy could be straight out of 1966 Southern California ....

by the mid-'70s those nice striped crewneck shirts were not as easy to come by as they'd been in the '60s, and people were wearing rock t-shirts, novelty t-shirts, logos, slogans ... it was a golden age of cool/stupid t-shirts ..... "ass, grass, or gas, nobody rides for free"-type stuff, Mouse t-shirts, Dead t-shirts, surf/sunset t-shirts, raglan baseball shirts ....

instead of Charlie Brown's zig-zag stripe t-shirt people were wearing shirts with pics of Charlie Brown, it was definitely a devolution but it was intentional

the '70s could have used some more bucket hat action ... we all had baseball caps and floppy white tennis hats with green under brims (tennis years) but the bucket hat was a bit MIA for a while there among the youth at least, it was more of an old man's hat for fishing and golf

baseball hats with long hair behind the ears, a la Dazed & Confused, and knit ski caps, yes

/\  that was a cool logo, Christian Piper, also did the bizarre Made in the Shade cover ... good articles in Rolling Stone about the tour, started off with a bang with the flatbed truck in NYC, then the pics of the rehearsals in Montauk at Warhol's house, plus the Fordyce, Arkansas episode, the inflatable prop, the great LA Forum shows

but all these years later I'm still bummed about no Mick Taylor ...

but they still had their moments ...... like here

https://www.youtube.com/watch?v=oCuACnB5JmQ

about real Late '70s Prep t-shirts, they were there at every school and college, made up specially for intercollegiate and intramural tournaments, regattas, spring festivals, drinking contests, parties, etc., they're like relics now .... college event t-shirts sponsored by liquor and beer companies, don't think that flies anymore ....

we used to have great rowdy drinking tournaments, every one of them had a t-shirt made up for it, after the event if you wore the shirt you were seen as a waste case 

didn't stop people from wearing the shirts, I just looked at a YouTube of some idiots I recognize having one of those old-school beerfests, made me laugh

there was more than one kind of mid-to-late '70s prep of course, it's just that the ones I hung with were Deadheads ... all of them ....

in addition to the regatta and  t-shirts of every kind have always been a guilty pleasure, there's always going to be some tyro clutching Fussell's Class and talking shit about the crassness and vulgarity of the shirt with writing on it ... they're right of course but the world's a sick joke anyway   

and Incontinence pants and Puma shirts when I was a teen though in college they were subpar

you could have the best of both worlds wearing an Eat a Peach t-shirt or a Stealie or even a Blues for Allah under an untucked, unbuttoned Brooks, Press, Bean, Co-Op, or Coop ocbd ..... 519s, 501s, 505s ......