Why don’t duvets or sheets state their size?

[Booooooooom]

Cleaned out the linen cupboard this morning. We have every size bed from super king down to single and in sorting out the cupboard I realise 90% of our sheets/duvet covers/duvets don’t state their size and the duvets their tog! How hard can it be?! Is this a thing? Does anyone label their linen?

I've written sizes on ours - just too much swearing otherwise, when I find I'm trying to fit a swimming cap onto an exercise ball (if you see what I mean)

The bedding I have from Ikea and Zara Home is labelled with the size. I have marked the rest myself, and which way around it needs to go, where necessary.

My 11 year old has a small double bed and when buying her bedding I purposely bought a duvet a size up from the standard model for that size bed. Not because I like it to hang down low but so that I could buy the absolute square size and never even need to look at which way round the cover and insert need to be!