"Are you wearing a suit?"

Translation: Dych chi'n gwisgo siwt?

[etincelleux]

What is the difference between "dych" and "dach"? One of the options for this one was "dach chi'n gwisgo siwt".

[ChristinaMarieW]

Zero difference in meaning, just regional variation. One would see 'dach' more in North/West Wales, for example.