BEAGIMEG Women's Tank Top Cut Out Sleeveless Bodice Bodysuit Party Clubwear

Is this stretchy? i’m normally a us 4 in dresses and a medium in shirts, what size would i order?

I am 5 9 and wear a 34d. i typically wear a size 4 or a medium. what size would you recommend? sometimes bodysuits are hard because i am tall.

What material is this made of?

I am 137lb and 5’4 34d in the chest should I get a small or medium?