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

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

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

about which thing are you talking.