A speaker says “100 and a garment” then clarifies that 100 meant dirhams. What matters?

Kitab al-Iqrar: Conjoined Amounts, Divine-Will Clauses, and Options

• The first wording already proved 101 garments
• The original hundred was unspecified and must be clarified
• Even one garment was not binding
• The word thawb converted the hundred to dinars