From their website:

Prince's Sensory Delights is dedicated to produce adorable, high quality children's clothing specially targeting, (however not limited to), those with Autism, ADHD, Sensory Processing Disorder, Developmental delay, and Downs Syndrome. Our desire is to help parents and their children with special needs improve the quality of life

They eliminate seams and tags, have weighted clothing and clothing with various textures and fidgets. Might be helpful for many kids. They only go up to size 10, so it's too late for my kid.