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When you have an hourglass shaped body, you want to show off your curves.
To show off your waist, get a bathing suit with side insets. To show off your chest, wear a bathing suit top that has underwire to support it. Finally, a bikini instead of a one-piece will be best for your body type.
Don’t wear a tankini. Because they hide your slim waist, they will make you look wider. If you don’t want to look disproportional, I suggest to not wear a mix and match style bathing suit. Don’t wear boy shorts because they will hide your curves as well.