Embellishment is a commitment, not an accessory, and the dress has to earn it rather than hide behind it. The good ones treat beading or sequins as part of the construction, placed where the fabric is stable enough to carry the weight. The bad ones scatter it across something flimsy and call it detail, and within a week you've got bald patches where the stitching's given way and loose threads catching on tights. I learned that one the hard way on a dress that shed sequins onto a bus seat like it was moulting.
Before you buy, check what the embellishment is actually fixed to. Run a thumb over it: if you can feel the backing fabric flex and gape between stitches, that's where it'll fail first, usually under the arm or at the zip, exactly where you move the most. Look at the inside too, not just the front. A well finished one has the beading or sequin work backed or lined so the stitches don't scratch, and the hem and seams are bound properly rather than left raw to fray under the extra weight the decoration adds. If you're starting from nothing, go for a plain shift or slip cut with embellishment only at the neckline or hem, not head to toe. It's the easiest one to wear more than once without people clocking the repeat, and it behaves better in wind and on stairs than anything fully covered, which tends to have a stiffness that doesn't move with you. The weight matters more than people assume. A heavier, well backed fabric drapes with intention, it hangs rather than flares, and that's usually the difference between a dress that looks expensive and one that looks like it's trying. Cheap versions are often lighter than you'd expect, which sounds like a good thing until you realise it's because there's nothing underneath holding the decoration in place.
For everyday wear, keep everything else quiet. A plain coat, flat boots or simple heels, no competing texture, because the dress has already spent its one big idea on sparkle. I wear mine with a soft wool coat and nothing else shiny, not even a bag, and it still reads as dressed up without looking like I'm trying to outdo the dress itself.
Buy it for one specific occasion in mind, not as a general solution to "going out", because that's exactly what it is.