one of our members has been asking questions- becoming interested in working with wool- i am sending a few pictures of some (samples) that show different sized perle cottons used in various ways.
these are parts/blocks from some of the projects i have done in the past few years.
the bottom embroidered flower is wt 5; the blanket stitch on the blackbird/pie is wt 8
this block i used size 12 perle cotton
i hope this gives you an idea of the differences in the wts. i will (after the holidays have settled) make a (sampler block) with all the sizes side by side to give a better example