hehe I love that anecdote about Betty!
I actually admire those who have always reworn pieces/wore vintage on the red carpet before it became trendy c. the late 2010s, like Kirsten Dunst and the Olsen twins (all of whom even bought their own pieces long into the "just borrow it" era).
And it's true that the newfound trendiness of "archive" makes it hard for us mortals to get our hands on older clothes ....but if you guys notice, the pattern tends to be that these prices are sky-high mainly for designers who are trendy in the present day/whose labels are still in business. Of course there are exceptions, like secondhand Lacroix has never been cheap, neither is Romeo Gigli (but you can still score some amazing things for two digit prices if you set an alert and are patient, I'm a little afraid he's already been mined though), no chance in hell I'm ever going to score things from Nicolas's Balenciaga era for cheap either (in fact I fear what will happen to those prices once his mid-later 00s work get 'rediscovered', it's going to go like McQueen) Vivienne Westwood prices have also spiked since the Tiktok generation discovered that choker but they were also never cheap (edit: I just read about her death...rest in peace, queen....and yes, it's going to send prices of her label higher too) ,....but mostly, if you have a handful of the better fashion magazines from 2005-10, you can score some nice pieces for accessible and sometimes dirt cheap prices if you look on ebay or therealreal. I mean, we're not ever going to score couture gowns for pennies but I once saw a Theyskens-era Rochas top (worn by Gemma in the show) going for $58 on TRR. And let's not forget, so much of the secondhand prices are about perception too. John Galliano's pieces for his own label were going dirt cheap for years, even his Dior stuff (and Dior is never cheap) was comparatively undervalued because his name was still tainted by the incident that got him fired. It wasn't until the late 90s/00s became trendy again and then MGC reissued the Saddle bags, that the prices spiked. so far Alber-era Lanvin can still be found for not-absurd prices, and I know TFS aren't big fans of Marc Jacobs, but we can't deny he was hugely influential to the everyday look of a certain type of mid-late 00s girls, a lot of his work from then is going for sub-100 on TRR, and that includes stuff in natural fabrics/made in the U.S.A.
Bringing this back to Balenciaga/Demna - now might actually be a good time to start looking for secondhand Balenciaga, if anyone is a fan of Demna-era work, since the scandal might have, as
@Mutterlein put it, taken the wind out of the brand's sails a bit and there's a chance that might be reflected in prices (I liked his first collection but would only pay for Ghesquiere era stuff secondhand if I could afford it that is).