Got it finished by Halloween! Slip stitch pattern means both sides are knit at the same time. My modification was to cast on only 42 stitches, and scale the length down to a 6 year old. As it is, it’s too long. She’ll grow into it :)
Only two skeins needed!

(LOVE the slip-stitch method of knitting this! So fast, back and forth knitting that creates a tube! Clever.)