Pattern is posted in PDF format on the right. Let me know if you need it in HTML. It's not even proofread yet, so expect booboos. I'm going to try to test knit a second sweater to it.
I did a lot of thinking and reading the many comments (thank you!). I was, originally, thinking of a Star Stitch collar myself. I spent some time playing around with swatches after seeing your comments. But in the end, I'm voting no, for several reasons:
1) It's a summer sweater. Extra bulk is not so desirable here.
2) A Star Stitch collar would cover up the back panel and saddle shoulders completely. I'd kind of feel sad about this.
3) The 1x1 rib at the front edge is nice and thick; with a collar sewn to it, it feels like it would be too bulky. (I had also considered a bit of attached i-cord, but the edge is so neat that it would be unnecessary.)
I think I'd use a different structural design — probably raglan to avoid seams, and no saddle or back patch — if I were going the collared route on this. I might play around with options on the adult size sweater. Because yeah, I can't help myself. I love the Star Stitch enough to try an adult version!
Thanks again for all your input, and sorry to those who voted yes on a collar. But hey! You can always add one!