The Mister Freedom® Cabana Shirt is true to size, with a relaxed fit. We recommend wearing a Medium if you are usually a Medium in mfsc shirting, or in our Rock'n Roll Shirts
To avoid shrinkage issues, each shirt was washed, on delicate with cold water, dried in a heat dryer, low heat setting, and THEN sized individually. A shirt cut from a Medium pattern might have shrunk to a Small, or stayed a Medium if the vintage fabric was sanforized.
We determined the sizing according to pit measurements only, laying the washed/dried garment flat and buttoned-up, without pulling. Shoulders and body length are pretty consistent, more-or-less matching across all the fabrics, with balanced proportions for that vintage style of un-tuck shirt.