Bedding is basically blankets which can be crafted so they're actually the same thing, aren't they @Fairislefandango?
I spent a fun hour (in 15 minute chunks, because I'm a mum🙄) making gauge swatches, and I dropped 1.5 stitches and 1 row per 10cm square when I went from 6.5mm to 7mm hooks.
On this basis, I'm going to go with 7mm for my next swatch with the poncho yarn, and try and ignore the fact that I lost exactly the same number of rows and stitches when I went from 7mm to 8mm, which makes no sense.
Love that cupboard, @AngeloMysterioso - my stash is occupying a selection of plastic boxes stacked in our bedroom, which DH is politely ignoring.