One of my favorite things to do is to go rummaging in the housecoat/pajama section because you can find these wonderful polyester house dresses in an assortment of fun designs.
I like to put a belt around them and wear them as dresses. They are so lightweight and comfortable. All you have to do is put some sandals on, and you're ready to frolic around in 70 to 80 degree weather.
Grandma was always right about hand-me-downs.
You do have to be careful about runs in polyester. I have been terribly disappointed when picking up a dress with a fabulous print that had a run at the bottom or near the sleeve. So hold it up to the light and search meticulously.
This one was only $5. It has blue and purple tulips at the bottom. It sorta looks like a Monet painting.