Size Chart for Adults is based on chest measurement.

YOUTH SIZE CHART (Junior    /     Misses) Small 2-4 Medium 4-6 Large 6-8 X Large 10-12 2 XL 12-14 Christian Urban T-shirts Size Chart Size Chart.... ADULT SIZE CHART (chest measurement) Small 34-36 Medium 38-40 Large 42-44 X Large 46-48 2 XL 50-52