A lot of the current earrings are too small, at least for Miqo'tes. Most you have to zoom all the way in and really look for them to spot the little speck that's supposed to indicate the presence of a hoop earring (even though it doesn't actually look like one). There are some bigger but ugly earrings like the cactuar or bomb earrings. And the peach blossom ones would probably look nice on a female Miqo'te, but are a bit too girly for a male Miqo'te like my Y'kayah. The horn earrings and others of its style are the best I've found so far, but I'd really like some simple metal hoop earrings that are big enough to look like hoop earrings and not like a tiny speck stuck onto the corner of my ear.
But, more on-topic, yes, I'd also like to toggle any slot's item as visible or not, just as we already can for helmets. Baring that, an equivalent ability that's built into the glamour system would work too.