In the 1960's underwear was boil washed, it came out a dirty grey colour whatever colour is started out. Elastic soon went saggy with this treatment. Everyone wore saggy shapeless grey pants of which they were mildly embarrassed.
In the 1970's with the coming of automatic washing machines and nylon briefs life became more colourful and better cut.
With todays low temperature washes cotton Lycra lasts longer and underwear can be made to stretch and fit well around the body. You can now be proud of your underwear and want to let other people see it. Colour fast dyes and fun prints makes underwear a thing you want to display.
Skin-tight jeans and shorter shorts have reduced big boxers and trunks to boxer briefs (square cut underwear) and as more men wear actual briefs speedo swimwear will become more common in public.
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