1:2:2:1 (s:m:l:xl) has been the general ratio i've always heard. your market will probably skew that a bit though. some guys have never sold a sm, some never a xxl/xxxl.
We are doing about 2:3:4:3:1 these days. We do tailor it to the specific shirt though; some some designs we might not even print any extra larges on, and others no smalls (if we're pre-printing them for an event or such, I mean).
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