Summarize:

When you wear sequin pants, allow them to get the attention they deserve; avoid lots of sparkly jewelry that draws attention away from them. Try to limit your jewelry to 1 or 2 carefully chosen items. For example, a simple long gold necklace over a plain black sweater with gold sequin pants would be plenty for the holidays. For jewelry with casual outfits, either avoid it or keep it fun and not sparkly: for example, bright plastic flower earrings with sequin jeans and a T-shirt and sneakers would complete a cute, casual look. To avoid a visually overwhelming outfit, your safest bet with shoes is to keep them plain when you’re wearing sequin pants. Wear plain black heels or flats for dressier occasions, and plain sneakers or sandals in black or white for casual wear.  Low-top, flat sneakers tend to look better with sequin pants than high-tops; try a simple, solid color low-top to finish off a casual outfit with sequin leggings, joggers, or jeans. Unless you’re dressing for the holidays, always avoid wearing sequin shoes when you’re wearing sequin pants. If you decide to add sequin shoes for the holidays, make them a different color sequin, for example black sequin shoes with gold sequin pants. Be sure not to include sequin anywhere else in your outfit. Try wearing long hair up in a simple bun or ponytail when you’re wearing sequin pants. For shorter hair, just your regular loose style without accessories or too much volume will complete your look nicely. Avoid piling on lots of sparkly makeup when you’re wearing sequin pants; keep it limited to some simple eyeliner or mascara and matte lip color. Body glitter is a definite no-no when you’re wearing sequin pants, unless it’s Halloween or you’re going to a costume party. With sequin, less is more. If you’re wearing sequin pants casually, a plain, solid-color denim or bomber jacket would look great; a sequin bomber jacket would be too much. If you’re dressing up, a simple black peacoat would be a stylish addition to keep you warm.  Try a simple black faux-leather jacket with your sequin pants for a casual, glam-rocker look. Also avoid pairing your sequin pants with other attention-grabbing dressy materials, such as fur. The overall effect of sequin with fur would be quite overwhelming even for a dressy event.
Wear simple or no jewelry. Keep your shoes plain. Style your hair and makeup minimally. Avoid elaborate jackets or coats with sequin pants.