But one look is still frowned upon: wearing a suit jacket with jeans. A sport coat or blazer is fine with jeans, but a suit jacket has long been considered a no-no.

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Texture plays a vital role, which is why Mashburn warns against simply pairing any suit jacket with your jeans. “You want something that’s got a little bit of heft,” he says.

This time, officials say, they've got it right. A recruit tries on his new fitness suit jacket during uniform issue at at Recruit Training Command in Great Lakes, Ill. on April 24.

Menswear marketers have been pushing suit jackets and their matching trousers as stand-alone separates since the mid-1990s. No wonder more men of all ages have become adept mix-masters.