The first jersey dress I owned was a bottle green wrap style from a supermarket clothing rail, bought for a tenner because I needed something that wasn't jeans and didn't need ironing. It taught me that cheap jersey can still look like something, but only if the seams are decent and the fabric has enough weight to skim rather than cling.
It's not the dress for anything structured or occasion heavy, a wedding where you want a defined waist, an office where the dress code leans towards blazers and proper tailoring. Jersey moves with you, which is exactly the problem when you need something to hold a shape instead. Thinner jersey in particular shows every seam of your underwear and clings in all the places you'd rather it skimmed, so this isn't the fabric for standing around at a drinks reception under bright lights. For fit, I've learned to go by the shoulder and bust measurement rather than the size on the label, because jersey brands cut wildly differently, and a dress that's snug on the hanger often has enough stretch to still work, while one that's loose on the hanger can end up shapeless by lunchtime. Watch the neckline on anything with a wrap or v shape, because jersey has a habit of gaping more as the day goes on, not less, and a dress that sat neatly at nine in the morning can be showing more than you meant by three. Sleeveless styles are worth trying with your arms raised in the changing room, since jersey under the arm is where it pulls first.
Where jersey earns its reputation is in how it survives real wear. A good one goes through fifty wears without losing its shape if you wash it inside out on a cool cycle and skip the tumble dryer, which flattens the stretch and shortens the life of the fabric faster than almost anything else you own. Mine from three winters ago still holds its shape through the knees, though the colour has softened from a proper navy to something closer to dusk, which I don't mind on a dress that's done that much work. It's brilliant through autumn and early spring under a coat, forgiving on days when your weight shifts a bit either way, and genuinely miserable in a heatwave if it's a heavier jersey, so keep a lighter weight one for the hot months.
Would I still reach for this without a coat, in daylight, standing still?