i am using a yarn i bought in germany. i would say its inbetween worsted and bulky. i am making this as a gift for a friend and he picked the yarn. so i have to modify. hope it still turns out.
i think i'll have trouble with the fringing though. i am not entirely clear on how the self-fringing works. any suggestions?
If you're making the scarf, this is a project where guage isn't going to matter too much. (yay!! lol) So it shouldn't be a problem to use a thicker yarn, you just might want to ch less or it'll be longer than the pattern.
For the self-fringing -- just leave a nice long tail whenever you begin/end a row.