Yes, you can still use this pattern in a worsted yarn knit in the round.
Figure out what your gauge is - 4 stitches/inch maybe - and figure out how big around your husband is. Multiply your sts/inch times his inches and that tells you how many stitches it will be. If you want it really baggy, you add a couple more inches. Say you want it to measure 40 inches when done, then times my hypothetical 4 sts/in, that's 160 sts. Look at the pattern to see if there's a size that has you cast on more or less 80 sts for the back or front. If there is, use that size for any shaping, just remembering that the gauge is different and you'll have to figure out where their sts and rows per inch varies from yours.