I actually never got past the parking lot of this little museum, which I found as I was driving around Jo'burg's northern reaches, on my way from the Military Museum to dinner. I saw the sign for the museum, and the words "Costume" and "Museum", which set off the "must get info for bedfull_o_books" alarm. I pulled into the parking lot and wrote down all the details for a future visit with her.
Then I lost the notebook.
Fortunately, there are websites:
http://www.places.co.za/html/bernberg.html has a couple of pictures and a longish description, which begins:
"Get a fascinating glimse [sic] into the history of women's costume over the last two centuries. The Bernberg Museum is a branch of MuseuMAfrica, but in a separate building."
http://travel.yahoo.com/p-travelguide-2760501-bernberg_fashion_museum_johannesburg-i actually lists contact information and hours
Corner of Duncombe and Jan Smuts Avenue, Forest Town, Johannesburg, Gauteng 2193 South Africa
Category: Museums & Galleries
Phone: +27 11 646 0716
"Dedicated followers of fashion and style slaves come out from behind your Gucci shades and Diesel caps and delve into the fascinating world of fashion history. The often bizarre rituals of fashion over the centuries, particularly in South Africa, are on show at the Bernberg Fashion Museum. From the embarrassingly silly to the ridiculously tedious, humans appear to have done it all when it comes to clothing. The museum is closed on Sundays, as well as on Christmas Day, Good Friday and the Day of Goodwill. Parking is available on site and admission is free."
Open Hours: 9am-5pm Tue-Sat
The place is very small; that much I could tell from the outside. One of the other sites I've seen says it's temporarily closed, and other sites disagree with the above hours, so it's probably worth calling ahead. Besides, if you call ahead, I think they can arrange guided tours.