Don't know anything about fashion but I've found them useful. Had one for years. Several types. Belt pouches, drop pouches, canteen rigs, armybsurplus, and even a -what I call- a leg holster. Really miss that one.
Definitely try making one your self! Not only will it be suited to your daily needs, It'll have a lot of value to you.
I got this gas mask bag for $3 surplus, and I use it for papers and notebooks you need easy access to. It straps sideways around your thigh and fits perfectly my map, moleskine, composition book, phrasebook, and camera. Doesn't pull your pants down, and doesn't look too tacticool.
Google 'drop leg pouch' for more examples.
View attachment 38275