An open or open tip bustier is definitely a NOT for small A or AA cup sized breasts. An open bustier looks nice on a B or above cup girl, but not for us!
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This open bustier will not make your waist so much smaller. And therefore it will not affect the shape of your breasts.
If you want a seductive look, try an open shelf bra or an under bust waist cincher corset instead.
A shelf bra, with the right band size, can offer a lift and actually suits us better than an open bustier and you can have the same effect!
An under bust corset that ends just below your breasts can also give you a lift and flatten your stomach at the same time, so your breasts will have a more definite shape and can seem bigger and fuller.
So no worries! The open or open tip bustier is not for us but there are many other types of lingerie that can make you look great even if you have small breasts!