To find the sale price of the shirt, we first calculate the amount of the discount and then subtract that from the regular price.
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Calculate the discount amount: \[ \text{Discount} = \text{Regular Price} \times \text{Discount Rate} = 56.90 \times 0.20 = 11.38 \]
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Subtract the discount from the regular price to find the sale price: \[ \text{Sale Price} = \text{Regular Price} - \text{Discount} = 56.90 - 11.38 = 45.52 \]
Thus, the sale price of the shirt is \( 45.52 \).