There is a nice one here: http://www.shopinthemaking.com/sister-mary-cardigan/ that does include 24" as one of the sizes.
Or here is one on Amazon that has a few patterns: http://www.amazon.co.uk/Childrens-Sweater-Cardigan-Knitting-Pattern/dp/B0038Q8ADC I would guess that the one sized for age 6 would be close.
And finally a collection of a few different options that also includes 24". http://www.ebay.co.uk/itm/Knitting-Pattern-Sirdar-4193-childrens-school-cardigans-DK-24-36-/200792411195#ht_1634wt_947
I hope you find something you can use!
Or here is one on Amazon that has a few patterns: http://www.amazon.co.uk/Childrens-Sweater-Cardigan-Knitting-Pattern/dp/B0038Q8ADC I would guess that the one sized for age 6 would be close.
And finally a collection of a few different options that also includes 24". http://www.ebay.co.uk/itm/Knitting-Pattern-Sirdar-4193-childrens-school-cardigans-DK-24-36-/200792411195#ht_1634wt_947
I hope you find something you can use!
