Fibra Natura Whisper Lace Yarn is a similar yarn: hand wash, lace (33 sts or more/4 in), and 50 gram. You may also like Shibui Knits Cima Yarn, which is another similar yarn: hand wash, lace (33 sts or more/4 in), 50 gram.
What about yarn that have the same look and feel? Find more yarn with a smooth / uniform texture, is super soft, and a low (drapey) twist.
You may enjoy taking a look at the Rowan Kidsilk Haze/Fine Lace Caris Pullover, Rowan Fine Lace Worship, Rowan Kidsilk Haze/Fine Lace Goldie Pullover, and Rowan Fine Lace Jackie kits all using Rowan Fine Lace Yarn.
Hopefully our suggested project ideas for Rowan Fine Lace Yarn can help you come up with your next exciting new project idea!