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At your size, 58" would be more than fine. I'm bigger than you, once had a Nunatak BackCountry Blanket, which is 61" at the shoulder and 51" at the hip, and I could easily wrap that thing around me nice and snug.
But what I'd do is simply put on what you'd normally be sleeping in, lay down on the floor on your back or side (depending on how you sleep), have your wife/a friend take a tape measure and fairly loosely drape it around you at your widest point (should be shoulders, unless you've had children.....), add a few inches for tuck, and you've got your width at the shoulders! At least, it seems like that would work.
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