The real test of a printed dress isn't how it looks on day one, it's whether the pattern still hides a coffee splash after the third wash and whether the colours have gone slightly chalky from the machine or stayed true. A lot of them fade unevenly, the darker ground colour holding on while the brighter print goes dull, and you only notice when you line it up against the first photo you took of yourself in it. The good ones come out the other side looking the same as they went in.
In an ordinary week a printed dress works hardest when you stop treating it as an occasion piece and start layering it like everything else you own. A plain cardigan or a denim jacket over the top calms down a busy print instantly, and a flat sandal or a trainer takes it from "dressed for something" to "just what I put on". Boots and tights do the opposite job in colder months, pulling it into something that reads more autumn than holiday. Before you buy, check where the zip sits and whether it's metal or the cheaper plastic kind that catches on the lining after a few wears, check the hem for a proper double stitch rather than one row that'll unravel the first time it snags a heel, and hold the fabric up to the light to see if the print is dyed through or just sitting on the surface, because the surface ones crack along the fold lines within a season. If you've got nothing like this yet, start with a small, busy print in colours you already wear, not a big bold single motif, because the busier prints hide the little marks and creases that come from being folded into a bag, and they go with more of what's already hanging in your cupboard than a statement print ever will.
What separates one that lasts from one that doesn't usually comes down to the weight of the fabric and how the print was applied. A dress in a fabric with a bit of substance drapes properly and doesn't cling or crease the second you sit down for a few hours, while a thin, slippery one rides up and shows every seam underneath. Cheaper printing fades at the fold lines first, so check the inside of the sleeve or the underarm seam where it's been pressed hardest. Good construction means a hem that doesn't pull when you walk, buttons sewn on with proper thread rather than one loose loop, and a lining that sits flat instead of bunching at the waist after an hour of wear.
Tomorrow morning I'd put mine on with a cardigan, flat boots and nothing else to think about.