You don’t have to wear a lot but I usually recommend one or two pieces at least just because they’re small things you can add to really tie a coord together. And it doesn’t necessarily have to be regular jewelry like a bracelet, necklace, or earrings. Smaller accessories like wristcuffs and pins/brooches that go on your clothes are great for this too. You can go without any jewelry if you really want to but it can leave your coord looking a little plain and jewelry can really help to take a plain coord to the next level. It can often depend on just how much detail you want your coord to have as well. An OTT coord will probably have a lot more jewelry than a Casual Lolita coord.