Button-back Skirt Slits

One place you do still occasionally see rear button closures are skirt slits (or vents, as some call them). Even mainstream retailers occasionally pick up this trend - for example, Victoria's Secret has no less than three variations among their sleek line of pencil skirts, like this one:

Not to be outdone, BeBe has three styles of its own, like this one:

Here's another example for House of Dereon:

The detail has shown up on some dresses as well, such as this plaid chemise from Barrie Pace: