A striped one-piece suit is always a good idea. Even if one has a bikini bod, a good one-piece is indispensable for more active days at the beach and water-based family get togethers (solid coverage and security is key in certain crowds).
Side note: I have nothing but love for anyone who chooses to wear a bikini in any scenario - you do you. Personally, after 20 years (cringe) of barely working out + two babies, you'd have to pay me a million dollars to walk onto the beach in a two piece. But perhaps that won't always be the case. Perhaps when I'm 50, I'll do it for free. But I want to make it clear that no matter your body or age, if you want to wear a two-piece, go for it!
99.9% of my beach apparel and accessories are nautically inspired, so when I think swimsuit, I think stripes, I think navy + white + red (or any combo thereof). These modern takes on a classic nautical look will work this summer and beyond, and each has a little detail or two that make them stand out from a sea of boring basics.