I received my Classico today (41/42R) - very nice suit, but I think I have the same question as New Shoes1.
I am 5' 10" 185 lbs. I can go down to a 40R in most Hickey Freeman and I would say that a 52R Canali fits me pretty darn good off the rack. I am wondering if this jacket is too small? It definitely fits tighter than a 52R Canali. Is this too small or I am I just not used to wearing a suit that is this fitted? The pants fit pretty good - the pockets don't lay completely flat as I have a bit of an arse.
I'm not sure, but are the lapels bowing slightly and is the collar pulling away from the neck a little bit? If so, it's very slight since, overall, the fit looks good. I would take front, back and side pictures and post in the Tailor's thread. They have a much better eye for evaluating fit.
I agree with you that this is the smallest 42L I have ever tried on. I've never sized up to a 44L in anything and wear a 42L in Corneliani, Zegna, Ralph Lauren Polo, Samuelsohn, . . . everything. Yet, currently sending back my 42L to see if the 44L fits.