Help with yarn substitution for pattern

hello! I want to knit the my favourite things number 9 cardigan for my mum. The problem is that the pattern calls for wool and my mum can only wear plant fibers like cotton or linen. Could any more experienced knitters advise me on potential yarn substitutes for this pattern that would fit the appropriate gauge? or if it is even possible to knit the pattern using cotton? I understand it would have some differences visually etc. but I hope someone can help!
thank you so much!

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Have you tried yarnsub.com ?
You can search by gauge, fiber content and other options. Might be a good option for you to find. Suitable yarn.

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Many people who are allergic to wool are not allergic to merino, but you’d have to take your mom to a wool shop to check on that.

Cotton yarns don’t have as much stretch as wool. Acryllic might be a good choice, or an acryllic / cotton blend.

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Hello
I pretty much always sub yarn from the one used in the pattern. Obviously you can’t expect exactly the same look, feel, drape, but you know that already.
The yarn in the pattern has 2 strands together making an aran weight of 16 sts to 10cm.
I would start with what fibres your mum usually likes, does she prefer cotton, cotton linen bind, bamboo, acrylic?? Then I’d go to my usual online store and look for yarns of that fibre in aran weight and find one I liked the look of.
I’ve made several tops and sweaters in 100% cotton and find they wash well, they aren’t as soft as some other yarns but my son choses cotton over acrylic or wool. I like the softness of bamboo but its quite heavy. I’ve just finished a sweater in recycled acrylic and it’s super soft and warm and I’m finding it just as cosy as the cashmere merino silk blend sweater I was replacing.
Some cottons are quite matt to look at and some have an amazing sheen, what woukd she prefer?.. those are the things I’d be asking your mum.
If she has a wool allergy she may not want to go into a yarn shop but you might buy a few single balls to show her and to swatch with.

Be sure to check how many meters you need for the sweater, not just how many balls. The number of balls for the chosen size multiplied by how many meters in a ball. Then calculate how many balls of the sub yarn to buy based on how many meters each ball has. This part is vital or you could run out of yarn.

This is a cotton linen mix in aran weight

https://www.woolwarehouse.co.uk/yarn/drops-bomull-lin-all-colours

And cotton

Obviously there are other brands and stores, this is just an example.
Make sure to swatch (and wash/dry) and check your gauge and that you like the fabric before starting out on the full project.

I hope this helps.

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