If you had a forgetful child who was prone to losing their possessions at school, when did they grow out of this? Or did they ever? Did you find a good way to support them to develop responsible habits?
I have a 7 year old who is in her second year of primary school (not in the UK) and the amount of gloves she gets through is unreal. She's also lost bike helmets, jumpers, P.E. kits, hats, socks... You name it, if she can take it off or put it down, she loses it. Everything is well labelled and we do often find things in the lost-and-found but sometimes months later and often not at all, especially in the case of gloves.
I know she's not doing it on purpose and she does understand that her clothes cost money, so what can I do apart from labelling everything and continuing to remind her to put her things away safely in her bag as soon as she takes them off? The leap from nursery to primary school was a big one as in nursery the staff keep track of the children's things and if they are labelled properly you are unlikely to lose anything, whereas in primary school here the children are expected to look after their own things. In her first year she was losing things almost every day and I'd do a silent cheer if we got home with everything she had that morning. So I'd say she has improved a little bit, but it's also early days for this year and we're already down 3 gloves and many other things have been lost and then thankfully found again.
I'm dreading the weather getting colder when she has to start wearing the more expensive thick mittens instead of the thinner relatively cheap ones.