359 yards sport weight yarn- I used 1 skein of Madeline Tosh Pashmina (75% merino, 15% silk, 10% cashmere) 360 yards per 117g skein; in the curiosity colorway (a lovely blue/purple that to me looks just like lilacs).
24″ US 7/4mm circular needle
tapestry needle for BO and weaving in ends
unstretched- 16″ tall x 26″ around
gently stretched- 13″ tall x 34″ around
aggressively stretched 10″ tall x 64″ around
Using tubular cast on, CO 180 sts onto needles, pm (place marker) and join for working in the round. Work in 1×1 (k1, p1) rib until there is only enough yarn left to knit one or two more rounds. (As I was in a car at the time I was unable to accurately measure this but I estimated about 5 or 6 yards give or take, to be safe you may want to leave a little more). With yarn tail threaded on the tapestry needle work a sewn tubular CO, weave in ends and wear everyday for a week before you remember to take it off to wash/block it.
If you (like me) prefer written instruction with good pictures when you’re learning a new thing, for the tubular cast on and bind off, check out The TECHknitter’s CO and The TECHknitter’s BO or Montse Stanley’s The Knitters’ Handbook… (which is my absolute favorite resource for all knitting questions). The tubular CO and BO are the sort of knitting that makes perfect sense when you’ve done it but can be completely frustrating when you’re trying to learn it, so if those links didn’t work for you try a google search for many alternate methods to achieve the same result.