It started at Phillip Lim with this three-piece skirt that you could mix and match and swivel to create your own look. And then there was this skirt-on-skirt action going on at Rodarte. And this dress-over-a-skirt thing at Wayne. I thought about it and decided it was kind of like the modular shelving you get at Ikea, where you have a certain number of pieces you can mix and match to create your own personal look. And then I realized, duh, that's what your whole closet is anyway; so much for the modular analogy.
But anyway, point is, we've been layering shirts and jackets and vests for years; we even did that whole dress or skirt over pants or leggings thing for quite some time. But this, ladies and gentlemen, is a revelation. Skirts on top of skirts on top of... skirts. It's like a big same-sex orgy, except instead of guys on top of sweaty other guys or a T&A festival, it's glorious, frivolous, kinky skirts.