As posted earlier, Trevira was a multi purpose cloth used in both men's and women's clothing. It wasn't just two tone. It was a cheaper version of original mods mohair and tonic suits. Became more of a smart girls fashion as the guys moved towards Barathea blazers with a Yorkshire Rose and hankie/tie pin. The older lads wearing - and copied as you got older - hand made suits and tailored jackets like the original mods.
Daft high waist trousers, tank tops, star jumpers became a mainstream fashion mainly for divs and younger kids. Anyone genuinely into fashion wouldn't look twice at them outside gear like Skinners. You can always tell the bullshitters as they never mention the transition from suedehead to patchwork jumpers, round collared shirts slight flares and Oxford bags. Same with the Northern Soul fashions. Always at the front of fashion at the time. Go to Samantha's in 1975 and there weren't many in bags. Straight leg jeans or cords, Levi 501's and generally a black v neck jumper/leather bomber. Not from Harringtons either. The only people who remember that were those who were there. Many talk about the fashions in the mod revival of the late 70's onwards rather than 68 onwards. It was very different. The "new" mods here and in Europe tend to be much more in sync with the original U.K. Mods rather than the Who/media driven fantasy put forward these days.
There were a few local original Skins/Mods in their mid sixties - unless you were very precocious , that's how old you need to be to have a hope of being an original Mod - who put on Ska, Reggae and club soul nights a few years ago. Like being Down Broadway all those years ago but old enough to drink legally