One of the internet's longest-running points of cringe is anything made of denim that isn't a pair of jeans.
Here's how the naming works: if it's made of denim, we put a "j" (for "jean") in front of the word to make it sound ridiculous. The most common example of this is jorts, aka jean shorts.
You've heard of jorts, but I bet you've never heard of jairs.