Simier FariryWomen Work Casual Knee Length Dress Spring Summer Short Sleeve Travel Hide Belly

What material is this? Is it 100%?

is the fabric different for different prints? In the pictures, it appears that the flower prints are more polyester and the solids are maybe rayon?

I want to order it for my girlfriend but i dont know the size she is 5'5" and and 149 pounds I think, what size would you recommend?

I’m 5’5” and 1/2 and 115 lbs. I don’t want skin tight but I do want fitted. Would the small fit ok?