Iris

A worsted yarn, 70% Alpaca, 20% Silk, 10% Merino Wool, 437 yd (400 m) per 100 g ball.

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Use instead

Your pattern uses 10 balls of Iris.

Same weight and fiber family, and close in length per 100 g. Closest first.

Same length: 4,370 yd. Buy one extra ball to be safe.

Yarn	Fiber	You need	Shop
Suri Alpaca Lang Yarns	100% Suri Alpaca	41 balls of 109 yd	Buy at Wool and Company
Luxury Alpaca Cotton Fusion Rico	52% alpaca, 48% organic cotton	22 balls of 207 yd
Venezia String	53% Cashmere, 27% Wool, 20% Silk	23 balls of 197 yd	Buy at LoveCrafts
Fishermen's Wool Lion Brand Yarn	100% Undyed Wool Fiber Content (color Birch Tweed): 90% Wool, 7% Acrylic, 3% Rayon	10 balls of 465 yd	Buy at LoveCrafts
Vintage Madelinetosh	100% Superwash Merino wool	22 balls of 200 yd	Buy at Jimmy Beans Wool
Shelter Skein-Dyed Brooklyn Tweed	100% American Targhee-Columbia Wool	32 balls of 140 yd	Buy at Wool and Company
Tones Brooklyn Tweed	100% American Columbia Wool (24 microns)	32 balls of 140 yd	Buy at Wool and Company
TML Triple Twist Madelinetosh	100% Superwash Merino wool,	34 balls of 130 yd	Buy at Jimmy Beans Wool

Same weight: the weight number when the source gives one, or the brand's weight word (DK, Worsted) when it doesn't.
Length per 100 g within 10% of this yarn's, when both list a ball weight.
Gauge within 10%, when both list one.
Same fiber family: animal fibers (wool, alpaca, silk…), plant fibers (cotton, linen, viscose…) or synthetics (acrylic, nylon…), whichever this yarn has most of.
Closest first: still made before discontinued, then more fiber in common, then closer length per 100 g.
Among yarns that match just as closely, ones sold by our partner shops come first.

Knit a swatch before you start: a different fiber can change your gauge. To add a safety margin, use Skeins for a yarn swap.