Try to dress simply. Try light clothes in pale pastels. Perhaps tanktops that you can pull lower depending on what the situation calls for (if your family is around or not
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Get a swimsuit that accents your skin and hair colors. Get it one color, but perhaps the design is a bit more devious than acceptable. Go shopping with one of them and pick out about 5 to try on that may seem a bit promiscuous. Ask them how it looks and which one they think you should get.
Tell us how it goes!