According to Alexander Del Rossa's size chart I should have ordered an XL - but this is listed as oversized and loose fit so I ordered a Medium.
The medium is really too big  and I had to take tucks in the solder seams to make the garment shorter and neckline higher.  The company's size chart should have been adjusted accordingly.  I  just ordered a small and will see out that fits - rather than the recommended XL,