The Medieval Hand-Washing Bowl is a bowl sims normally use for cooking made buyable and edited to function like a sink. It can be placed on virtually any surface, but placing it on a sideboard, as pictured here, is recommended for realistic-looking animations.
The items are found in appropriate Plumbing sections. Price: Cask & Barrel Antique Tub / The In-House Outhouse - 150 simoleons, Medieval Hand-Washing Bowl - 50 simoleons.
If you wonder about the dress, this is Widow Dress Conversion by Kiara.