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Compare review comments with the official material and construction information. Look at a range of comments instead of reading only those matching your initial opinion.
Look for clear photographs showing the fastening instead of assuming it is hidden in a particular seam. Look at the fabric surrounding a fastening for strain rather than judging the fastening in isolation.
A simpler top can let the sequins provide the main emphasis of the outfit. Do not assume a two-way surface effect is present unless the listing describes it.