I bought this size as a cover up for my daughters Easter dress. She is 2 yrs 9 months old, 32 lbs and size 2T fits perfect. It is lightweight and soft. In case you like the dress too, I bought a 2T:
https://www.amazon.com/gp/aw/d/B00W8NTR6U?psc=1&ref=yo_pop_mb_pd_title