This morning, as I put on underpants, a brassiere, sweatshirt, sweatpants, and hooded sweatshirt, I reflected that nowadays I am actually wearing panties, a bra, sweatshirt, sweats, and hoodie. And socks and shoes.
So what other items have changed?
My grandmother wore clam diggers, my mom wore pedal pushers. I wore capris.
My grandmother wore culottes, my mom wore split skirts, I wore gauchos.
My mom wore bell bottoms, I wore flares.
My grandmother wore girdles and a brassiere, my mom eschewed the girdle and burned her bra, I wear shapewear. 
There are some small detail differences as fashions change, of course, but I think it’s fair to say these garments are more or less the same with new names.
my pantaloons now have a zipper. my trousers no longer have a crease.
do I have my pants on?
All the items in the OP are simply shortened versions of the longer names. Does that really count as having “changed names”?
My kids think I’m being quaint when I refer to my “dungarees”–they profess not even to understand what that word means.
And fashionistas now refer to them as a pant.
Not yet mentioned.> waistcoat (wescot) =vest. Referring to trousers as “pant” is not so new. I was hearing this maybe 40 yrs ago in a nice mens store.
Slacks
Same in French. I wouldn’t dare go in a store and ask for “des pantalons”.
It’s LE pantalon, please.
As if it had only one leg :rolleyes:
That’s the US/British difference, not an age-related one.
Thongs used to be footwear.
And you admit this why?
Braces –> Suspenders.
Interestingly enough, the words “shirt” and “skirt” are actually cognates. Shirt is a native English word while skirt is from Old Norse, the language of the Vikings. It appears that the meanings diverged once “skirt” had entered English usage. English is a West Germanic language and Old Norse (which eventually became Danish, Norwegian, and other languages) was North Germanic.
On the clothing forums I frequent (sf, aaac), these are different items. Vests have 3 or 4 button closure and higher neckline, wasitcoats have one or two buttons and a lower neckline.
In groovier times, low-rise pants were known as hip huggers.
I’m a Rev War reenactor. In America, both before and after the war, men wore waistcoats over their shirts. (Shirts were underwear.) The length of the Waistcoat , number of buttons and neck line changed over the years but they didn’t become “vests” until the 19th century.
From the waist down, we wore breeches, pronounced britches, both knee length and full length.
Examples here: 18th century men’s clothing from Jas. Townsend & Son
Dickies still sells pants they call dungaree jeans, but otherwise dungarees seemed to have become jeans after the 1960s.
NIce site. I don’t think I could pull off a tri-corn hat, but I wouldn’t mind if frock coats came back. 
My mother wore army boots. And you have no idea fat she was.
What were Daisy Dukes before Daisy Duke came along? Were they cutoff shorts?
I’d guess (denim) short shorts.