Being a newbie, I am at a loss when it comes to choosing yarn sizes to match patterns. I finally found a sweater pattern that I think I can handle. It calls for Morehouse Merino Bulky which is:
100% Merino, bulky weight
115 yards per skein / approximately 4 oz.
#13 to #17 / 2 to 2½ stitches = 1 inch