"Hai una dimensione più grande?"

Translation: Do you have a larger size?

[dnovinc]

Would you say this in a clothing store ? Or maybe Hai una taglia più grande?
What is the difference in usage between misura, grandezza, taglia and dimensione ?

[f.formica]

Misura and taglia would be used in a clothing store; dimensione and grandezza are more generic and could apply to a house as well as a book, but would be odd for clothing.