I've got a couple of patterns for wrist-warmers which are in US terminology, but I'm bemused by the sizing.
They seem to specify "worsted weight" yarn which is aran weight/5mm, I think, yet the pattern requires a 3.5mm or 4mm hook?
If that wasn't odd enough, I just tried knocking up a couple of swatches (of crocodile stitch, that's a new one on me and I've made a gazillion amigurumi projects in my time
) - I started with a 50% cotton yarn which was a bit fine at 3mm but a lovely colour, and the swatch came up about right. But it was so horrid to work with that I tried a bog standard acrylic DK, and the swatch came out too big.
So if DK on a 3.5mm hook is too big, won't aran be massive? Or have I totally misunderstood yarn weights?! I've used Paintbox aran to make chunky projects before!
The pictures on the pattern make it look quite fine.