I'm considering making a vest (waistcoat) from a "vintage" (30s? 40s?) English pattern which calls for 11 oz. of worsted-weight yarn. I prefer working with finer yarn and needles and have no problem with modifying the pattern to suit my smaller gauge, but I'm not sure how much wool to buy. Can I substitute 11 oz. (300 g.) of fingering-weight yarn for 11 oz. of worsted and have about the right amount? I know I'm not likely to find if for 7 d. per ounce as mentioned in the pattern, so I'd like to have some idea of how much to buy.