Ski cap is a type of field cap.

BUR #60088 is pending approval.

remove implication m43_field_cap -> military_hat
create alias m43_field_cap -> ski_cap
create implication ski_cap -> field_cap

Finally, there is a better naming alternative for such style of field cap with ear flaps that can be secured on top by buttoning while not in use. Counterpoint to topic #34395.

Also, since there are other non-WWII German styles of it such as:

Finnish

Finnish

Austro-Hungarian

As noted by the Wikipedia page, beanies (knit caps) are also sometimes known as ski caps and given most image results on google image search come up with beanies or similar winter hats instead of the military hat the "ski cap" tag would very easily be mistagged.