Another option I would recommend is one used by scouters going back many years. The US Army used to issue a wool jac shirt that was considered a cold weather shirt, usually for wear in Korea or Germany. The color is OD green, the pockets are identical to a scout jac shirt but only have one button instead of two. These have been used my scouters on or near military bases for years. You can find them on ebay regularly. Sometimes they are overpriced, but sometimes you'll find a good deal. I got one for 9.99 a few years. I put an NESA pach on the back, and the red universal BSA patch on the front