Is it permissible to borrow non-interest-bearing goods, such as clothes and gasoline, and then return them with an added benefit or an amount of money?

The rulings regarding loans are not restricted to money but apply to anything that can be precisely described. The loan must be repaid in kind, and if there is no equivalent, then its value on the day the loan was given. It is not permissible to stipulate an increase when repaying the loan, whether in quantity or quality, unless the increase comes from the borrower without a prior condition, in which case it is permissible and considered an act of kindness.