Not necessarily a fashion style, but an going trend in fashion: this whole assigning jeans an arbitrary size number nonsense.
Sizes for guys' jeans make sense -- there's a number for waist and length, they can find exactly what they're looking for in an instant. Or as is still frequently the case, their wife can pick out jeans in their size for them, and they'll always fit.
But women's jeans sizes are archaic. Guys wonder why it takes women so long to shop for clothes? It's because you have to try everything on. Everything. Because you rarely get easy waist and length sizes. Instead its some arbitrary number. Likely because clothes makers realize that women don't want to think about what size their waist is in inches, so they'll sell more jeans if its a random number.
And it's not like you can just figure out your number and never have to try them on ever again. Every brand has some slightly different crazy size system. Sometimes even two different pairs of jeans from the same brand with the same number won't fit the same. It's maddening.
But that's only for waist size. When it comes to height, you have a choice between only two, sometimes three, and on rare occasion four options. Typically it's just Short and Regular. For some reason stores rarely carry many Long (at least in the style you probably want), which is funny, because the people modeling the jeans in ads are often probably wearing Long, because models are usually on the taller side. I haven't looked in awhile, but I'm pretty sure guys jeans come in more than three different heights. Which, again, are not standard, but vary slightly from brand to brand.
I say we start a petition for women's sizes that actually make sense! Those people who are insecure and don't want to figure out their waist size in inches need to suck it up and deal, so that it can be easier for the rest of us.
(Also, why do flare jeans almost only come with the super-low cut style waist that you can't sit down in without half your butt being exposed?)