Now don’t quote me on this, it’s based on my memory from an art history lesson roughly 20 years ago (Kunst-Grundkurs im Saarland, Ü). But, if I remember correctly, there is an inverted relationship between fashion (meaning the way people present themselves in general) and the economy. When the economy is booming, people tend to go with simple, understated shapes and colours. When the economy is slowing down, they tend to go overboard, putting more effort into their looks, wearing more noticeable jewellery etc (possibly to keep up appearances that they’re still fine?).

Again, these are tendencies, not struct rules. But maybe that’s what you’re noticing?