Hi Brooke,

Thank you for contacting Mearto with your appraisal inquiry.
While I've not found this exact dress online (highly unlikely as it's couture and not just ready-to-wear/off the rack), similar Moschino slip dresses are retailing for between $4,000-6,000. The values Mearto provides are fair-market, for auction purposes; the standard industry multiplier/divider to convert a retail price into a fair-market one is to divide the median value - in that case $5,000 - by two for a high estimate and three for a low estimate (making a fair-market value $1,500-2,500).
Based on the photos and information provided, and subject to examination, this is:

A vintage Moschino Couture silk slip evening dress
Spring/Summer collection, 1998
colorful abstract pattern cut on the bias with sweetheart neckline, full length.
US Women's size 6
CONDITION: This dress appears to be in very good condition; value assumes no tears, repairs, stains or odors.
PROVENANCE: Inherited
$ 1,500-2,500*
*represents a fair-market value for auction purposes; retail or asking price may vary.

Please let us know if you have additional items to appraise, or questions/concerns, and thank you again for using Mearto.
~ Delia