When in Paris recently I stopped in Berteil, capital of BCBG and bought an olive heather herringbone (with windowpane overplaid) tweed sport jacket and some argyle socks. The jacket was very J. Press, except for a very squared-off and somewhat built-up shoulder. The argyles are first-rate. I noticed a big stock of Alden tassels loafers. All in all, the place seemed more Trad than not, but what are the main differences between BCBG and Trad?