Photo shoot gowns

I am looking for suggestions for photo shoot gowns. Both style suggestions and brand.... I decided I really want to do my maternity photos this time around in a pasture with cows 😍😍😍. Cows are soooo underrated and are extremely maternal animals and I just want to love them. I wanted to do something a little fancier / more chic than the lace top and jeans I did last baby. But I just dont know what kind of style would complement my setting rather than look out of place. I'm a pre pregnancy size 18 so plus size has to be an option. I'm planning to do the shoot late April/early May so long sleeve is ok if the fabric is light. Looking to stay under $100, ideally including shipping. Please help me!