Stockings are often associate with sexy outfits, in fact they are sexy even when you’re wearing nothing else. Some people find them endlessly fascinating. Fishnets or seamed, hold ups or not, stocking fetishists enjoy many aspects of stocking wearing. The look of stockings held up with a suspender belt under a short skirt for example is something that many people with a stocking fetish love. Some combine the love with other fetishes such as latex and rubber, because not all stockings are nylon.
Whatever they’re made of though, someone is bound to appreciate them. Wearing or looking at someone else wearing stockings can be very sexually arousing.
If popular culture is to be believed, you can split cisgendered straight men into three categories - boob guys, ass guys and leg guys. The reality is a bit more complicated (and a lot less cis and heteronormative!) but it's still true that a shapely pair of legs are a huge turn-on for a lot of people. For femme-identified people stockings and suspenders with a pair of high heels are a great way to set your legs off, and short skirts are always a safe bet when you really want to turn heads and grab attention from someone in particular. Masc-identified folks might like to look into cargo shorts, which are a particularly flattering length for showing off strong calves!
