Reporting back: It was not what I expected at all from a main store in the home country of an international, albeit small, fashion house. The main store was tucked away on a backstreet, with a few little cafes and local shops, it was one small room, about half the size of the grocers next door, not much stock either, only 3 pairs of jeans, and my rubbish french didn't help too much.
The surplus store was in the next street over, just among houses, it was slightly bigger, and had slightly more of each item, but a smaller range of items. Prices about 50% off, but unusual sizes mostly.
I tried the Workers and New Standards, New Standards fit great, but they only had bright red, which isn't my cup of tea, but I know my size so I can order some more confidently now. However, I've just checked my email and they seem to have a new cut, Tight jeans.
Anyway, some nice stuff, a few military jackets that they don't have on the website, I think from the previous winter collection, and I got to try enough that I have some more of idea what size I am, but mail order still seems to have more in stock.