Japanese phrase
___を試着したいです。 ___ o shi chaku shi ta i de su
Meaning
I would like to try on ___.
When to use it
Politely asks to wear an item briefly to check its fit. This expression is natural and courteous when speaking with store staff.
Example dialogue
このコートを試着したいです。 ko no kō to o shi chaku shi ta i de su
I would like to try on this coat.
はい、試着室はこちらです。 ha i shi chaku shitsu wa ko chi ra de su
Of course, the fitting room is this way.