Can I try it on?
'Provarla' — pro-VAR-la. The pronoun 'la' attaches to the infinitive.
The essential phrase for any clothing purchase. Always try before buying — Italian sizing varies between brands and even between product lines within the same brand.
'Provarla' = 'provare' (to try on) + 'la' (it, feminine). For masculine items: 'posso provarlo?'. This construction with an attached pronoun (clitic) on the infinitive is very common in Italian. The question mark comes from rising intonation — word order stays the same.
Dove sono i camerini?
Where are the fitting rooms?
Follows naturally after permission is granted.
Posso provarli?
Can I try them on?
Plural — for more than one item.
Posso fare una prova?
Can I do a fitting?
More general — asks to try without specifying the item.
Italian fitting rooms typically allow 3–5 items at a time. An attendant may hand you a numbered token. Some upmarket boutiques require you to be accompanied. This is normal — not a sign of distrust.