It has never occurred to me NOT to layer skirts over other skirts or over/under dresses.  Perhaps my first impressionable images of skirts were in illustrated rhyme books where it was clearly visible that girls wore petticoats under their dresses.  Whatever the origins of the multi-skirted habit, with the multitude of skirts that I have, and the amount of mixing up that I often like to do, I'd feel a little disturbed if I wasn't allowed to layer up my skirts.  People might comment and say it's a 'messy' look that serves no 'purpose'.  Looking messy and being impractical has never really bothered me all that much but I would counter argue and look to Miu Miu SS08 who executes the double-skirted dress perfectly well in a satisfactorily 'neat' fashion.  The combination of the bodycon mini dress and short full skirt over it also clashes sexy and flirty (supposedly two very similar things but they are miles apart in my book!).  It's sort of similar to those 80's peplum suits, except the peplum is quite extended and dramatised. 

So by all means, laugh it up at my patch-match, random pairings of gold lame knee length skirts under black PVC skater skirts or two floral patterns fighting with each other on two different shaped skirts.  But I think an old navy Topshop skater skirt over a vintage lycra dress is hardly going to set the 'Oh no, what has that layering lunatic done again?' alarm bells off.

What's more, is that just one store like American Apparel can easily serve your double skirted needs with the pairing of something like this cotton spandex dress and this thick knit jersey skirt resulting in a college cotton version of Miu Miu's circus affairs.