Length in pattern is 15cms but there is no info on circumference. For the smallest size (15cms as above) the foundation chain is 32 - it's mainly worked in htr with a puff stitch embellishment. It's 15 rows.
Tension 16sts and 12 rows measure 10cm square over htr on 4mm - essential to work to gauge.
Yarn is DK or 4ply.
I am a born-again crocheter - did some basic stuff at primary school (and knitting) and have just taken up needles and hook again in the last month or so, have made a few squares and experimented with a few fabrics like spreading fans/treble crochet fans and making flowers/leaves etc but am pretty inexperienced and just building up skills!