SGladwell
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What we call "2-1/2 button" is where the lapel rolls smoothly to the second button, that being the only one used. Sack coats are typically what we call a "3 roll 2" which means that the lapel folds over flat through the first button - the top buttonhole is often finished on the inside rather than the outside for this reason.
I'm probably wrong, but I've always used 3-roll-2 to describe what you call "2-1/2 button" above.