Boy shapes are generally pretty straight. There isn’t more than a four inch difference between the bust and the waist or the waist and the hip measurements.
I have linked to posts that already have information on the topics. Otherwise, I have given you a bit to go on.
You either want to wear a shirt that breaks up your torso and gives you shape or wear a plain shirt and let the rest of the outfit do the work.
You can go with something structured, a blouse that is gathered at the waist, or even a men’s button up with a belt at the waist. If there is no waist on your blouse you’ll need to add a belt or wear something that your blouse can be tucked into.
Skirts and Mini Skirts:
I think it’s a good idea to break up your torso with a high-waisted skirt. Skirts with wide waistbands are good for your shape. Flared, bubble or cargo skirts will give you a little extra shape as well.