I use the sharpest needle I have with the largest eye to accomodate what ever I'm using to tie it with. I like to use either a crochet cotton, or the embroidery floss... not the floss actually, the one that's rolled in a ball... I forget what it's actually called.... heavier than embroidery floss , not as slippery, sold in the same area.... you know what it is...
I never warmed up to the look of yarn...