17 1.75 oz/50g balls (each approx 104yd/95m) of Phildar Show 251 (acrylic/wool/mohair/nylon/polyester)

or

A DK-weight yarn with similar fiber content.

Poncho of rectangular panels in lace stitch.
Knitted measurements: Width across top 56.5”/141cm; length 36”/91cm.

Knitted in 4 sections and seamed together.