Here is a really nice early 1970s St Michael long sleeve shirt. 

Polyester Cotton mix fabric.

Window pane check in red, white and blue.

Made in Britain.

Dark blue buttons.

Size:

The label says 16" collar. We have measured this as follows;

Collar - 16"

Pit to pit - 21"

This was measured laid flat.

Condition: There is some light bobbling on the material but no stains or tears. All original buttons are in place except for one on the sleeve cuff but there is a spare still attached to the care label.