how to say the size "extra large \large\medium\small "in Spanish

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hi Lili,
- extra large = talla extra larga
- large =  talla larga l(L)
- medium = talla mediana or media (M)
- small = talla pequeña (S) 
con las letras, identificamos las tallas en la ropa

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the size of clothing,like" XXL   XL  L M  S "how to speak in Spanish

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In Argentina we use the same as you
S- Small
M- Medium
L- Large
XL- Extra Large
XXL- Maybe "Extra Extra Large ^.^"

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about which thing are you talking.