In the 1940’s, the suit trousers, slacks or pants were generally flat-fronted or featured single pleats. These pants were worn at the high waist with a 3-inch waist band.
Why is Harry Styles Wearing Pleated Pants? – River City Leather
Which Vintage Style Trousers are right for you? – House of Foxy
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Why is Harry Styles Wearing Pleated Pants? – River City Leather
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Pleats: They've Always been Cool
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Why is Harry Styles Wearing Pleated Pants? – River City Leather
Vintage 1930s-1940s the A. Nash Company Cincinnati Ohio Hand Tailored Navy Blue Pinstripe Pleated Suit Pants Trousers - Hong Kong