I spent two or three hours in Mainz yesterday....down on the walk-platz area. Mainz has a large population of Muslims, and you tend to notice things like this.
After a long bit of observation and pondering, I've come to note there are basically four styles of Muslim berka, the general outfit that Islamic ladies wear. Course, I admit....I am not an authority or such on the matter. But you tend to notice things, and put them into category or two.
So, there's berka version one: the 1930s one-size-fits-all type. It's black or gray. You could weigh 95 pounds or 350 pounds....it don't matter. It's pure cotton, and you have to be sweating up a storm if it's in mid-August. You don't shop much for this type, and if you really wanted the the low-fashion end....this is it.
Berka version two: probably the 1966 look. There's around eight colors, and it's less material. So if you were 95 pounds....you'd look lean and trim in this one.
Berka version three: probably the 1980s look. Lots of color. Cut to the form of the person wearing it, and you tend to look modern.
Berka version modern. This can be a pants outfit, with just enough of a berka look to note your status, but still look fairly modern, and maybe attract a different sort of guy.
I have the gut feeling that old-style 1930s type berka is dying out. It's mostly women in their fifties or older who wear it. And I would imagine in forty years.....the modern version will be the accepted type by most all Islamic women in Germany.