Shorts, flowy blouses (especially silk), and BRIGHTS (though I wear brights year-round)! Most of my seasonal swapping is fabric based; wools, heavy sweaters, tall boots etc. all get put away for spring/summer, and of course there are warm weather items that get put away in fall/winter like summery dresses, lightweight skirts, tanks, etc.. I also change my base neutrals and the core items in those shades: In the fall/winter I wear a lot of charcoal and black (though I am on a mission to remove a lot of that black), and in the spring/summer I wear a lot of gray and white.