Warm weather babies...

We live in Iowa where the temp just now starting to get into the 50s, and since we have a winter baby (our first) she has always been bundled up in hats, long pants, jackets, blankets, carseat cover, long sleeves... Not only is the weather getting warmer here, but we are going on a trip to Tennessee next month and it'll be in the high 60s to low 70s. It dawned on me that I have no idea how to dress my LO in this weather. 😂 Anyone out there in a warmer climate have any tips? What should we put her in to sleep? Is leaving the house without pants a norm or should we invest in baby shorts? Also have you taken your baby swimming and what do you recommend?