T-shirt sizes...

Finally, I got my package. And saw that the t-shirt I ordered was too large for me (I wear XL in my country, but that was... whoaaa).

Anyway, I have another package which is still on backordered position and contains 3 more XL tshirts.

The question is, can you change those to medium size?

Or else I'm gonna put all the t-shirts in washing machine at 90 C degrees (194 fahrenheit) to see if it shrinks.
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