I am all for pairing unexpected items together to create an unconventional look, it comes as no surprise, playing by rules is not for me. Creating your own is more risk-taking and way more fun!
My idea of making sequins less of a statement and a tad more on the casual side is by pairing with a low-key top -- tank, tee, sweater or sweatshirt. Minimal accessorizing for a daytime look, with sequins being such a standout piece, outfit add-on's should be kept a neutral tone. Ankle booties over a pump add a little edge; however, either will do.
All in all, to keep your look from being predictable -- keep away from being too matchy/matchy and trying to keep the same color palette throughout the entire outfit.