Simply:
what do you call these pants? Maybe knickers?
Learn English – What do you call pants that don’t go to the end of the feet
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Related Solutions
Is it possible you misheard? A not-uncommon (American) expression is "jazz hands" to indicate excitement:
usually ironically:
To do it right, you should make the "jazz hands" gesture as you say, with some enthusiasm, "Jazz Hands!"
More about the fabulous history of "jazz hands"
(Edit) If you are certain that the person said "jazz pants", then I have no idea what it could mean. "Jazz pants" are light, tight pants, used in "jazz dance" routines, usually black, made from some kind of stretchy fabric, and commonly flared at the bottom:
It makes no sense to reference dancewear on a cooking show, and I know of no idiomatic alternate meaning of "jazz pants".
Most generically, they would be called lapels (the left lapel and the right lapel). And, to the best of my knowledge, it's absolutely irrelevant whether it's a coat or a bathrobe that you're talking about—they're still called lapels. There are different types of lapels such as notch lapels, peak lapels and so on and so forth, but they're all lapels.
Best Answer
This style ending around the calf is called capri pants. Another type that ends above the ankle is called flood pants. A similar style from the 1950's is called pedal pushers, and an even older style is called knickerbockers. Most generally, these are all types of three-quarter pants.