Apparently, teacup holsters have been a thing since at least 2016. But it was just today that I was introduced to them (through this post humorously captioned "Open carry, in the UK…"). Needless to say, I'm a big fan.
Want one? There are many different varieties on Etsy: Leather ones, fancy Jacquard fabric ones, and someone's even selling sewing patterns for them.
image via LeatherHeds
Thanks, Argyre!