Elephant bell bottoms required platform shoes for a couple of years in high school. By the time I was a senior, worn Levis (still with flares, just not so big), Adidas or similar shoes, and t-shirts were the style. Levi’s denim jackets were cool all through school ('72-'78). Negative heel Earth Shoes were hot for a year in there somewhere.
I see no one’s mentioned tube tops yet; those seemed to just hold on through far, far too long.
huaraches?
Utah, high school in the late 70s.
Nike shoes, which had to be the white leather with the red swoosh which looked something like these.
Levi cords, but transitioning to denim.
Izod polo shirts.
And I found out that JC Penny’s polo shirts with little tigers didn’t cut it. Those of us without a budget weren’t part of the cool group.
East TN, '50s to '70s.
flavor squares lodged inside straws so when you sipped your milk it could taste like chocolate or strawberry crinolins bebops, or black & white saddleshoes worn with bobbysocks cuffed twice hula hoops, slinkys and scooters paperdolls Chatty Cathy Robby the Robot Barbie matching sweater sets worn with aligator clips TV dinners color TV Godzilla tearing loops off the back of boys’ shirts and collecting them pillbox hats skateboards teased beehives and greasy ducktails princess phones Dr. Kildare shirts Neruh jackets madras, burgundy, Weejuns and English Leather sockhops shirtwaist dresses circling the drive-ins mid-'50s cars folk, protest and beach music long straight hair Beatles haircuts GTOs Mustangs Motown heavy chain ID bracelets mini-skirts short straight hair all things British Jimi, Janis and 'fros
I carefully separated these but the spaces didn’t take.
Some of the guys in high school (mid 60s) wore boots similar to “Beatle boots”, except they were zippered and the zipper ran up the back of the boots. I’ve never seen them before or since.
Non-matching knee socks, for girls. I think it was limited to my school. A popular girl wore them one day, probably because she wasn’t paying attention when she got dressed. A teacher teased her about it, and the next day practically all the girls were wearing them. This was in junior high in the late 1970’s.
Born in 1981- a lot of boys had mullets and rat tails. Girls’ hair was crimped with really poofy bangs and headbands/barrettes.
Glasses frames were huge. Either gold wire frames, or thick plastic.
Shorts were still inappropriately short, like basketball shorts carried over from the 70s.
In high school, the boys were divided on style. Either we were rednecks who wore work jeans, flannel shirts, t shirts, and caps (and a subset of cowboys who wore tight wranglers, Garth Brooks inspired long sleeve shirts, big buckles, cowboy boots and hats- these overlapped with redneck), or there were the guys who wore JNCO, Fila, and those other kinds of huge floppy pants hanging off their butt with huge baggy shiny shirts. These guys often parted their hair in the middle and dyed it jet black or had a Caesar cut with frosted tips. These were the guys who I couldn’t tell whether they were trying to look like Eminem or the Backstreet Boys.
Girls wore flare leg jeans that were often quite tight fitting until the flare started. 70s inspired stuff was big. Platform shoes were seen quite often. You still saw the Rachel haircut pretty often. Midriff baring shirts were seen often, but not often at school because they weren’t appropriate. Girls quite often wore a handful of rings on one hand, several on one finger.
Bowheads! I was in grad school in the late '80s at UVa, and the prof I TA’d for would scornfully mutter, ‘Bowheads!’ every time one of the wahoo sorority girls (adorned with the oversized bows you describe) sailed by us. Apparently it had been big at her undergraduate university about a decade before, and met with the same response.
I have to chuckle because I recently bought a silk bow to clip in my hair and remarked, ‘Yowza, I’ve turned into a bowhead’ to the bemusement of the clerk. Thanks for the laugh 
Canberra Australia: '83 or 84
Coca-cola yo-yo’s were the biggest thing for about 4 months (at least in grade 7).
When I moved to Colorado Springs the same fad hit there in '85 or so for two months. Lucky me got to use the collection I acquired in Oz instead of having to buy them all again.
Elementary School 69-74: I wore whatever mom made for me. Played with jacks and barbie dolls, neighborhood games like Steal the Flag. Making fake fingernails with Elmer’s glue dried in the middle of your ruler, licking the blue/red pencil to “put on makeup”.
Junior High 75-78: Jeans with lots of zippers, cool pencil boxes. The layered look, wearing up to 5 shirts so the collars showed, some popped. Big, flat, brightly colored earrings. Hair teased into a mess and worn for a week at a time.
High School 79-81: Multiple ski lift tags hanging from your coat zipper. Bandanas tied just below the knee on your 501 Levi’s, day-glo shirts and accessories. Long thin scarves, like rock stars. Jocks wore rugby shirts, cowboys wore western shirts and cowboy hat and ag jackets. Boccle? sweaters, IZOD shirts, OP long sleeve T-shirts Long striped toe socks, earth shoes. Farrah Fawcet hair
45 y.o. and in a Dutch school here.
In eight grade: Grease stuff. Posters of John Travolta and Olivia newton-John.
In junior high:Swatch watches. Swiss digital watches with colorful plastic bands that could be swapped out.
For hipster and hippie kids: Palestina scarves. . Legwarmers. Buttons.
Male, 56.
Disco, polyester leisure suits with the gaudy faux silk shirts underneath. And big clunky shoes.
Regards,
Shodan
Washington, D. C. and Maryland suburbs of D.C., 1960’s
Penny loafers with bobby socks; you’d fold over the elasticized top part to make the tops very thick. Some kids wore two pairs to make them even thicker. (No pennies in the shoes- not cool.) Saddle shoes, which are ubiquitous in '60 era movies and tv shows, were not popular at all.
Low-cut, ballet-type flats without stockings or socks, showing toe “cleavage.” We girls considered them to be quite daring and slightly erotic; don’t recall what the boys thought about them, but no one hit on me.
Girls couldn’t wear jeans, except for one day a year - I think it was probably Sadie Hawkins Day.
Celebrated Sadie Hawkins Day (girls could ask boys out instead of waiting to be asked by a boy.) I was shy and never had the nerve.)
For girls, collars made of various materials to dress up a sweater or plain neckline. I had one that had pearls sewn onto the entire collar and I loved it.
Bad boys: white tee shirts but only cool if the edge of a sleeve was folded over to hold cigs.
Ah yes. Those would have gone well with my OP (Ocean Pacific) T-shirts.
For some reason, in Jr-high and high school (mid 80s) a lot of pseudo surf and skate clothing were popular. Even though I lived in suburban Connecticut:
Vans and Airwalk shoes
Powell Peralta “Bones” logos
Vision Street Wear
Quicksilver (which I assume is still popular as there is a huge store in Times Square)
The heavy metal look was popular in my school as well. Lots of mullets and teased hair.
Z Cavaricci and Bugel Boy jeans.
I went to college in 1991. It was figuratively as if someone flipped a switch over the summer that made everyone go shopping for:
-Flannel shirts from J Crew, LL Bean, Abercrombie & Fitch, or American Eagle.
-Doc Martins or Lands End Duck Boots
-Baseball caps that people spent hours making look like they were 10 years old. Especially if it was a South Carolina Games Cocks hat (personally I thought wearing a hat that said “Cocks” made you look like a homo).
-Some variation of an Absolut Vodka T-shirt. (Absolute Lacrosse, Absoute Dartmouth, Absolute Sigma Chi, whatever).
-Grunge, jam bands and alt rock music
I wore nearly all these things. In addition:
Everyone in elementary school (60s and early 70s) wanted PF Flyers so they could “Run faster and jump higher”
Wallabees
Mood rings
Smiley face jewelry
Feathered or Farrah Fawcett hair
Painter’s pants
Mickey Mouse watches
Early/mid 80s in Chicago, two-color denim Guess jackets were big, as were big (oversized) Levi jackets.
How about Painter Hats?
I am sure most Doper’s wore Skidz too 
In the 1950’s the pluto platter came out, later called a frisbee. The factory was right over my back fence, I used to raid the trash can for seconds.