Should my fiancé return the money he stole from the workshop at the cost of manufacturing the clothes, or at the price for which the workshop owner sells them in the market?

What the person did by transgressing against others' property is an act of betrayal that necessitates sincere repentance. This repentance cannot be complete except by returning what was taken. If the clothes are still available, they must be returned as they are, and there is no dispute regarding this. However, if they are not available or have been used, he must guarantee them by returning an equivalent if there is one, otherwise, he must return their value on the day they were stolen. The intended value is the price at which the clothes are sold, even at wholesale price, not the cost price.