Hey! Yes, generally it's good to label clothes and towels too, not just bottles, the teachers handle so many kids' things that mix-ups do happen. Since you want to pass the clothes down, one option I've heard works well is writing the name on the inner tag with a fabric marker, which is low-profile and doesn't damage the garment much. Some mums swear by those waterproof name stamps for fabric, they work on clothes, towels, and even socks, though the trade-off is the stamp impression is harder to remove if you're passing items down later. So honestly it depends on how fussy the cousin's family is about the name showing; for items like towels that won't be handed down, the stamp is really convenient, but for nicer clothes, sticking to the inner tag with a marker might be the safer bet.