I'm pretty comfortable using metric measurements and am getting more comfortable the longer I stay in the knitting and crochet worlds. U.S. crochet hook size H/#8 = U.S. knitting needle size #8 = 5.0 mm diameter.
The real killer used to be (and, for some brands, still is
) when crochet hooks showed only the LETTER and not a number on them. What does one do with a crochet hook "size F"? There's just no way to tie it in with any reasonable sizing system. Only when my hands permitted me to return to yarnwork in 2008 did I find that hooks and needles both were now labelled with numbers and, sometimes, mm diameter as well. Hallelujah!
But what happens in the UK system when very fine needles are...ah...needed? At least one local knitting instructor has said, while demonstrating stitches in a Fair Isle class and responding to a question about lace knitting, that she's used "6-ought" size needles. This is 000000 in American terminology, 0.75 mm in metric. But the list I initially referred to on my return (http://www.fiber2yarn.com/info/needlehookchart.htm
) doesn't provide UK equivalents. Do British knitters simply order from the other side of the Channel or use Continental brands?
The chart I'd like to know about is the one that translates "4-ply" and "8-ply" to terms like laceweight, fingering, sportweight, DK, worsted weight, Aran, bulky, chunky, and so on. Anybody?
Good discussion; thanks, DavidSydney63!