My recommendations for Paris from 2012:
Not super high end, but excellent RTW clothing:
You might wish to try these shops for well-priced semi
trad menswear. I own several pairs of their dress slacks,
the oldest of which is from the early 80s.
They are superbly made and have worn extremely well.
I haven't been to Paris in the last few years , but the last time
I checked, the stores carried the same style and quality.
Also recently endorsed by other SF memebers.