It was very popular in the 1960's by Princess Grace Kelly and First Lady Jacqueline Kennedy
A dress with empire-waistline features a waistline that rises higher than the natural waist, just below your bust-line. The waistline paves way to a skirt that may may be slightly flared. The empire-style dress has a high waistline under the bust with a narrower skirt. The skirt-style can flow freely or be a bit more fitted. An empire waist style is usually paired with a square neckline, wide straps or sleeves.
Both Greeks and Romans wore gowns with empire waist.
A lot of maternity clothing is designed with an empire waist. The waistline below the bust may feel more comfortable and natural to pregnant ladies. The freely draping fabric, over the stomach, may allow a woman's growing belly expand without discomfort. Maternity clothing often feature tie-backs, so that the garment can be loosened as a woman grows larger.