I bought two sets and they are perfectly thin and soft. My child is sensitive to the prickle of wool but she loves this and can wear it as a base layer in winter.
This is the third time I've bought from sweet little souls and we love the quality of the outfits and Heidi is a lovely person.
My one suggestion would be to have a nice thick band on the pant legs so they can be rolled up for shorter kids or pushed up to over the calf to keep clean.