My hands shook as I placed the $800 order. It was 2016, and the offer I’d made on an eBay listing for a vintage Ralph Lauren camel-hair polo coat had just been accepted. The purchase marked the end of a month-long search. It was also the most money I’d ever spent on a single article of clothing by that point in my life, when I was a 25-year-old budding freelance writer.
A decade later, what felt like a splurge has become a retroactive bargain. That particular coat—made in…

