"Do you want the shirt in size seventeen?"
Translation:¿Quieres la camisa en talla diecisiete?
I think tamaño refers to a 'generic' size. Ie, what size are you? Whereas talla specifically refers to a size label. Ie, that shirt is size 12.
I put a la in front of talla, marked wrong. Can not use an article with talla_ I thought in Spanish, an article is always used in front of a noun.