What are the rules on wearing sunglasses with the CAP uniform?

Conservative sunglasses may be worn with the AF style and CAP distinctive uniforms, except in military formation .  Glasses must be free of ornamentation on frames and lenses. (faddish styles and mirrored lenses prohibited).  Sunglass cases will not be worn exposed on the uniform. 

Please see CAPM 39-1, para for more information.