knowledge - Party Time with Captain Pun

The other day my good friend Captain Pun invited me to a party on board his new boat.

"What will the dress code be?" I asked.

Captain Pun said he'd email me the details. Later that day I received the following image in my inbox:

The accompanying message said only: "Solve the nonogram, then come dressed accordingly!"

Can you solve the three-colour nonogram to help me work out what I should wear to the party?

_{This puzzle can be solved without guessing. Note that cells filled with different colours do not necessarily need to have a gap between them. Numbers marked in bold are black, numbers in (circles) are (red), and those in normal weight are grey.}

Answer

Completed nonogram grid:

This is (thanks @msh210 !)

a Cluedo board,

and

the heart is in the LOUNGE,

so the dress code must be

LOUNGE SUIT.

Edited to add:

the puzzle is even more clever than I'd realised. The heart isn't just an arbitrary symbol: it represents one of the SUITS in card games. So both the words "lounge" and "suit" are clued (no pun intended) in the image!