Maybe not class. Maybe the word is status or social position?
Everything people wear has a message. E.g:
In the 1920’s the boyish shape appeared for women. This was due to the following:
Increasing emancipation for for women ( they’d got the vote). When women are gaining strides in emancipation they mimic the male shape ( 80’s, 20’s, WW2 60’s)
The loss of so many men during the war meant women were taking over male jobs, and they’d had increasing independence in WW1. As there were fewer men, women adopted a masculine shape.
When men have lots of facial hair it is because they feel threatened by women ( Late Victorian, Edwardian, 70’s and now)
The hemline reflects the state of the world economy. Short in a boom( 20’s, 60’s 80’s) long in a depression ( 30’s, 70’s, 90’s, now)
So everything has an unwritten code.
Contouring/ tattoos/ lipfillers/ extensions/ eyelashes are all part of the same thing. People have moved into enhancing their bodies as well as clothes. This is partly because trends tend to be recycled rather than new. There are no new pieces of clothing, so the body itself is used as adornment.
Donna Karen invented the last piece of new clothing in the 80’s which was the body.