I see you've found your dress now (it's lovely, I've seen it in RL, sadly after I'd bought mine!!) but yes, the Next one is def for the 'wide of hip' - I'm one myself 
It's really deceiving. I'd seen it online but ignored it despite loving the print as I thought it looked too pencil skirtish. It really isn't though, it's gorgeous on, 50s style. I'm going to wear it with black Mary Jane shoes with a little heel, a black cardi or cream sequin shrug, not sure yet, and red bag, nails, jewellery and hair :)