This is J.Crew's Printed Silk Chiffon Whitney Short Dress (item #11440), which originally retailed for $225, and has been on promotion for $159.99 for quite awhile now. This dress is numerically-sized, and is available in this one color, sweet cantaloupe. J.Crew describes the dress as such:
Whether it's for a wedding or a warm-weather getaway, this dress is a sensational choice for any special occasion. Crafted from lightweight silk chiffon with a delicate crinkled texture, its strapless silhouette features a fitted bodice with knot detail at the center front, a slight sweetheart neckline and a pretty lettuce edged hem at the waist. A-line skirt. Back zip. Interior corset for added support. Fully lined. Falls to knee; 25" from natural waist. Import. Dry clean. Catalog/jcrew.com only.I picked up this dress in a size 4, which is my normal size in J.Crew dresses. The dress fits true-to-size, and is a nice, comfortable fit. The fit is based on your bust and waist measurements.