You can spot a good shirred dress from right across a room. The gathered panel sits close without digging in, the elastic rows run even and flat under the fabric, and the whole thing moves like it's made of one piece of cloth rather than fifty rows of thread fighting each other. A poor one bunches at the sides, puckers where the shirring meets a seam, and leaves little red lines on your ribs by the end of the day because the elastic's been pulled too tight to compensate for thin fabric that couldn't hold its own shape.
This isn't the dress for a smart office or anywhere that wants structure. Shirring is all give, no architecture, so if you need something that holds a waist or skims rather than clings, look elsewhere, because the fabric is doing the opposite job here, it's hugging on purpose. It also struggles in real heat if the fabric's a heavy cotton blend, since all those gathered rows trap warmth against the body, so lighter viscose or a proper cotton voile version earns its summer place far more than anything with polyester thickness to it. Come fine autumn days it layers well under a jacket, since the shirred bodice gives a cardigan or shacket something to sit over without adding bulk. Over months, the elastic is the part that tells you the truth. Good quality holds its recoil through a full season of washing, lesser elastic goes slack around week six and the dress stops springing back, it just hangs there looking tired. Hand washing or a cool, gentle machine cycle keeps the stretch alive far longer than a hot wash ever will, and skip the tumble dryer entirely, heat is what kills elastic fastest.
The difference between a dress that lasts and one that doesn't usually comes down to what's actually threaded through the fabric. Proper shirring uses multiple rows of elastic thread sewn directly into natural or part natural fibres, so the gather has some weight and drop to it rather than sitting puffy and synthetic. Cheaper versions use thin elastic on thin polyester and the gathering looks flat and plasticky from day one, never mind after washing. Check the stitching where the shirred section meets a yoke or a cuff too, since that's the point under the most strain and where loose threads show first.
Before buying, stretch the shirred panel gently in the shop and watch how quickly it springs back rather than staying loose. Check the rows are even and parallel, not wavering or bunched at one end, and look at the fabric held up to light, because anything too thin will cling unkindly once it's gathered this tightly against you.