Paris Men's shop. But the logo doesn't match.
Well, personally I still think HSM's Gold Trumpeter line is quality enough for me. The fabric is great year around, and the patterns and cut match up well for me.
And I want to also chime in to say, don't alter those pants! So long as you think they are in original form at the moment, I'd be very cautious to alter anything at this time. They are a beauty, and a very very RARE one at that.