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Para smocks originally were slip over without opening/closure in front. Early German ones had integral short legs too. Later requirements included front opening/closure. See WWII pictures of Brit...

Why not one of each? Choose the one that suits the day. Any luck with the www for items, seems the choice is unlimited.

Difference between an anorak and a smock in military terms. Smock is a loose over garment worn over other equipment on your body, to prevent the equipment catching. Changed some since the first ones...