In everyday debt accounting, coins and measured commodities commonly appeared in repeated numeric formulas. Garments, as individual goods, did not routinely follow the same pattern.
Thus “100 and a garment” stays under ordinary analogy: 100 remains unspecified, one garment is known. “100 and a dirham” follows juristic preference based on usage.
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Why a garment differs from a dirham
Kitab al-Iqrar: Conjoined Amounts, Divine-Will Clauses, and Options
In everyday debt accounting, coins and measured commodities commonly appeared in repeated numeric formulas. Garments, as individual goods, did not routinely follow the same pattern.
Thus “100 and a garment” stays under ordinary analogy: 100 remains unspecified, one garment is known. “100 and a dirham” follows juristic preference based on usage.