Thanks for replying, but I was asking because "vestito" can mean "suit" as well:
We do the same thing in English. If you say your are dressing up, or getting dressed up, or wearing fancy dress, it means dresses for girls but suits for guys.
There are more specific words for suit and dress, but vestito is commonly used and understood.
The plural form, just like English, means clothing in general. "Look at all these dresses / forms of dress / outfits