To find out how much Wanda will spend on fabric, you can multiply the amount of fabric she needs by the cost per yard.
Wanda needs 9.8 yards of fabric, and the cost is $1.74 per yard.
So, the total cost will be:
\[ \text{Total Cost} = \text{Cost per yard} \times \text{Number of yards} = 1.74 \times 9.8 \]
Calculating that:
\[ \text{Total Cost} = 1.74 \times 9.8 = 17.052 \]
Therefore, Wanda will spend approximately $17.05 on fabric to make her costume.