Hey Styleless Chap,
Haven't posted on here for awhile.
As you have bought your suit and are having it altered, and paying for the alts, I will give you my opinion.
I like a long coat, but wear high waisted pants, so it balances out.
My gauge is rule of thumb, when the wear fists his hands (like a soldier to attention) the thumb is in line with the hem.
Most of the RTW I see now, its between the wrist and the knuckle.
As for the sleeves, most prefer to...