So.... COS looks to be a trendy expensive brand. Never even heard of it till tonight. Yes because of the style of dress if you don't have a dress form to make it look more flattering then a stock photo is better for presentation. In my opinion tho you should be steaming or ironing your pieces. Even though it's used pre loved clothing, it shouldn't look like it came straight from a hamper. Especially since it looks like you'll probably sale at a good price.

I get home from sourcing and everything goes on hangers onto my rolling rack. I start up my steamer and one by one everything gets a fresh press. It looks fresh and gets rid of the "goodwill thrift smell". I can get 20 pieces done in a hour.

Your customers will open their box with a freshly pressed dress that's been folded to minimize wrinkles. It's used but it don't look it. They'll be "damn this girl means business. I'll have to keep an eye on her closet!".