A size 30 in women’s pants corresponds to a size 10 dress. A woman with a waist measurement of 30 inches and a hip measurement of 40 inches can wear a size 30 jean.
Prior to purchase jeans, it is best to either try them on in a store or thoroughly check the applicable sizing charts. The inseam length of a pair of jeans varies by brand and style. The style of the jeans also influences how well they fit. A skinny jean, for instance, is intended to have a tighter fit than a bootcut jean.