Works in any yarn with the correct gauge! We used Tahki Yarns’s new cotton and linen blend “Aruba”. This yarn is textured and soft. Holds it shape and great to knit with! Sized to fit chest 37 (41, 45)“ with length of 22 (23, 25)”. We’re happy to help you with measurements and pattern questions! Just email info@jenniferknits.com or call 310-471-8733 and are friendly staff is available anytime Tuesday thru Saturday