Not one for retro clothing, except during carnival time here, but if you're really interested in wearing gear like that, why not have 'em made at a tailors? back in the 70's, I used to go to burtons. you paid a bit more, but could have them exactly how you wanted them, specifying things like the cloth, sewn in pleats & creases, turnups, tunnel loops etc; I never bought a pair of spencers 'cos I always favoured a more conservative, simpler trew. I think the widest I ever went was 32", which is pretty wide anyway. my last pair were made of dark grey harris tweed and itched like hell. looked great with the old black brogues, tie & waistcoat though.