Pls help me style this denim vest!

Hi!! I’m a 16yo teen girl and I’m a size L with a 32D bust size or maybe a tad larger for reference. This fits a bit large so the V neck ends right below my breasts so I need to wear something under it but I have no idea what would look good. I also have no idea what bottoms I’m supposed to wear. Should I just return it atp?