In the end, I knitted a facing to line the interior of the zipper. I wasn't happy with the contrast between the sweater color and zipper fabric color, and since Rob will not likely zip this thing all the way (althought he can! the zipper works! it's not just for looks!), that interior zipper will always be showing. So here's a shot of that (click for a larger view):
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And here's a shot of Rob heading off to work in his new sweater (I stayed up til 2AM to finish it so he could wear it for casual day):
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I felt such a thrill to see him wearing this sweater. He looks so fantastic in it! He is so impressed with my work and loves it. He told me he felt very loved when he wore it, which is exactly how I wanted him to feel. Merry Christmas, Rob!