What is the ruling on "malboos al-badan" (an amount of money given for the bride's trousseau) that was spent before the marriage contract (aqd shar'i) and a portion of it was returned, and how can one avoid doubt or the unlawful (haram)?

The questioner's statement: "I dissolved my engagement after the Sharia (definition) contract" is incorrect, because the one for whom the contract was made is a wife, not an fiancée. The correct statement is: "I dissolved the Sharia contract."

And as long as the man has explicitly stated that he forgives her for the clothes she bought with the full amount, and no cash remains from it, then she is not obligated to return anything from these clothes, and there is no suspicion of unlawfulness in that.