Aahhh. I see why it reads wrong. Where they've used 1/2" & 1/4" the computer makes the fraction smallers that the whole numbers. They forgot that it doesn't do that for 1/8" Try 3 3/8", but do it with cheap paper, sew it and all! Much easier to check and no fabric lost. I had patterns with "8ths" used before. No biggy.