All this posts referring to #14 assume the circuit is 15 Amp.
It just as well could be a 20 Amp circuit, and #12 would be required.
Really, in a garage or shop would be exempt from the neutral in the switch box reg by 2014 Code.... not so in the 2011
2014 NEC 404.2(C)
(C) Switches Controlling Lighting Loads. The grounded circuit conductor for the controlled lighting circuit shall be provided at the location where switches control lighting loads that are supplied by a grounded general-purpose branch circuit
for other than the following:
(1)....
(2)....
(3)....
(4) Where a switch does not serve a habitable room or bathroom
(5)....
(6)....
(7) Where a switch controls a receptacle load