You've hit on something that irritates me, there.
People (particularly film/programme makers) representing 1976/7 always make out that it was full of people sporting mohawks and wearing bin liners and bondage trousers, when it really, really was nothing like that.
The bit in the Great Rock n Roll Swindle (and it's the only bit worth watching) that cuts between the actual footage of the Sex Pistols on their trip down the Thames and the reconstruction of it, illustrates this perfectly.
(Cave Duck, Wed 18 Aug 2010, 15:10, 2 replies, latest was 16 years ago)

It was only due to the death of wotsisname recently
That I found out how much of the Sex Pistols image was engineered. I have a pair of Sex Pistols boxers, officially licensed, which I bought from New Look for a few quid.
( Labia Majora You keep on talking but it makes no sense at all, Wed 18 Aug 2010, 15:14, Reply)

Heh. Mind you, I bought some Country Life butter the other day.

(Cave Duck, Wed 18 Aug 2010, 15:17, Reply)

It's even more evident in Don Letts' superb ‘Punk Rock Movie’.
The original people were really inventive in their dress – by the time a ‘punk look’ was being marketed, and there were ‘punk nights’ in clubs etc the game was already up.
( Monty Boyce, My cheese game is strong, Wed 18 Aug 2010, 15:35, Reply)