Is it permissible to donate the value of jalabiyas that a porter mistakenly took for another woman, given that I do not know her and cannot return them to her?

Effort should be made to return the clothing to its owner through the store from which it was purchased. If that is not possible, its value should be given as charity on her behalf, with the intention of giving charity for the owner of the clothing, either by direct alms-giving or by handing it over to a charitable organization. If one despairs of identifying the rightful owners, he should give it as charity on their behalf or spend it on matters benefiting Muslims.