You need one that has proper cup sizes (as sewn) most garments are made in a standard B cup, which is 2" difference between high bust and full bust, different to bra sizing. Most patterns used to be B cup but now many are drafted for different cup sizes
Mass making of swing tops and those awful baggy tunics that make people look so large and frumpy is such a bad way of sewing but mass market rules. Curvy people look so much better in a garment that celebrates the curves
People, like me, who make the tiered dresses and want definition, always sew side ties in, to tie at waist level. I would not be seen in what would pass as maternity wear