Blush washes people out under the wrong light, and it can look a bit bridesmaid if the fabric is too shiny or the shape too fussy, so try it in daylight before you decide, not under shop spotlights that flatter everything. Once you find the right shade against your own skin, though, it is one of the most wearable colours going, softer than red, more interesting than plain black.
It sits well against things you probably already own. A tan or camel coat over the top stops it looking too sweet, and a leather jacket does the same job with more edge. Gold jewellery lifts it, silver can make it feel a bit flat and bridal. Boots, not strappy sandals, for most of the year, and a denim jacket thrown over it takes it from a wedding dress to a Tuesday dress in about ten seconds.
The difference between a blush dress that earns its space and one that ends up at the back is almost always the fabric. Cheap polyester in this colour goes slightly see through under certain lights and creases if you so much as sit down in it, which is a problem when blush is already a shade that shows every crease and mark. Look for something with a bit of weight, a crepe or a proper viscose blend, something that moves rather than clings or goes stiff. Check the lining too, a lot of blush dresses are made with a cheap lining that shadows through the skirt and ruins the whole effect. Seams should sit flat, any zip should be properly concealed, and if there's a self tie or a bow, it should be cut from the same fabric and not a flimsy offcut that frays within a month.
Good blush holds its colour surprisingly well if you wash it properly, cold, inside out, no tumble dryer, because heat is what turns it dull and slightly grey over time. It does show deodorant marks and makeup transfer more than darker colours, so a quick wipe after wearing saves you a lot of washing it doesn't need. Folded carefully it travels fine in a bag for a weekend away, though I'd avoid cramming it in with anything that has buckles or zips, since pale fabric picks up snags and marks from other things in there. After a season of regular wear, a well made one still looks the same dress, just softer. A poorly made one looks tired and slightly grubby no matter how carefully you treat it.
The mistake is buying it a size down because pale colours supposedly need a tighter fit. They don't, and a blush dress that pulls across the body only draws more attention to exactly the bits you weren't worrying about until you put it on.