Twinkle, twinkle! Generally, sequin anything is saved for nighttime, but I’m daring you to try wearing it out in broad daylight. I think it’s a similar challenge to wearing formal attire casually (add reference link), it’s all about mixing high and low, shiny and matte to shine through.
Try mixing sequin clothing in classic prints like polka dots or stripes with whimsical casual pieces. A denim jacket is my go to for dressing down any outfit, making it California cool.
Another go-to for me when I want to make something a bit more casual are worn in booties in a light color. Look for ankle boots that are flat and aren’t overly embellished, you don’t want them to compete with your sequin shift dress :P.