About 30 years ago, I was in need of some culture and bl**dy couth and so went with Mrs W to see "It ain't half hot mum" at the Futurist Theatre in Scarborough. The front row had been booked by officers from what appeared to be a local TA, and about 10 of them were there wearing full mess kit with medals. Windsor Davis marched onto stage at the start of the performance and glanced down. He instantly stood to attention, gave one of the salutes that only he could give, and asked for "Permission to carry on, Colonel?" For the rest of the evening he brought these members of the audience into the play and treated them as if they were the military audience for his concert party, adlibbing with them to his hearts content - he even got the rest of the cast to join in.
While the TA should not have been wearing mess kit and medals to a public performance, the whole effect contributed to a memorable night watching a very funny piece of comedy theatre. Sometimes, it may not be "correct" to wear medals or uniform to a function, but if the occasion calls for it then why not? No-one gets hurt!