https://www.aei.org/carpe-diem/chart-of-the-day-the-cpi-for-...
Not sure why the link doesn't show it, but this link came up on a Google Image search for clothing vs. everything else in CPI. Here's a link to the image itself:
https://www.aei.org/wp-content/uploads/2013/10/clothing.jpg
And the Fed (since the image only goes out to 2013): https://fred.stlouisfed.org/series/CPIAPPSL (apparel) vs. https://fred.stlouisfed.org/series/CPIAUCSL (all items)
My only point is, clothing has been cheap for a long time, and hasn't risen with inflation. I can't tell if your comment is saying that fast fashion is responsible for clothing being cheap, or what time "now" specifically refers to, so I'm not going to assume anything about that. Maybe I'm just adding to what you're saying in pointing out that clothing has been cheap for quite a while, and fast fashion has little to do with it (if anything, fast fashion is probably just a product of how affordable clothing is).
Of course, it's affordable because clothes can be manufactured cheaply in quite a few countries. Seems a lot of it is made in Vietnam, Cambodia, Bangladesh, etc. I doubt the workers there are paid 'well' by our standards here in the US.