Woolrich John Rich & Bros.™ buffalo-check shirt-jacket c/o J. Crew
Unfortunately (for you), it's no longer available and even if it was, it wouldn't likely fit as it was sold for 'boys'. Knowing that I'm a pretty reliable J. Crew boys size 12, I ordered it (originally $128, on sale for $99, extra 30% off for $69 plus free shipping), and it is 100% perfect. One of those kinds of things I almost wish I had paid full price for. The fit is ideal, and the weight (a heavy wool shirt/jacket) is great for Southern California winter.
A similar W's version is still available at a very steep $625:
There's a cute LL Bean version of a buffalo plaid available for $179 on sale:
Or this Banana Republic version on sale for $149:
In any case, looks like you could find yourself some buffalo checks for the end of winter...