It is very frustrating when you get a pattern that you like but want to substitute the yarn and the pattern gives you vague information about the suggested yarn. Or you look at the yarn label and cannot figure out what the weight of the yarn is. This has happened to me several time in the recent past. I have looked for patterns to knit clothing for my grands and frankly some of the suggested yarns in the knitting magazines are more than I can afford. I often want to substitute a yarn that I find on sale on or a closeout yarn but to do that I need to make an intelligent substitution. The pattern will tell you to use XYZ yarn and not show the weight of the yarn. You may then visit your LYS and find out that the label does not show a weight or give clear wear and wash instructions. How annoying. Now I know that some of you can just look at a yarn and decide what weight it is. Okay so I can judge a yarn to be chunky and usually I know a worsted weight yarn but the lighter yarns, forget it.
So I have to say Hats Off to Berroco Yarns and their labels. They give you detailed information so that you can decide which crochet hook or knitting needle you need to use as well as complete was/care instructions and the label indicates the weight of the yarn best of all. To the makers of yarns with mystery labels HELLO could you help a knitter out.