It is important to show that your outfit has been chosen with care. Usually, people wear neat, inconspicuous clothes in dark colours at a funeral. A suit with a shirt underneath is always a good choice.
Dark suit:
A dark suit is usually the most appropriate choice for a funeral. Black, dark blue or dark grey are appropriate colours. Make sure the suit fits well and is well cared for.
Shirt:
Wear a white, light blue or black shirt. Choose a formal plain shirt with no patterns or bright colours.
Tie:
A discreet tie in a dark colour goes well with the suit and shirt. Avoid bright colours or striking patterns.
Shoes:
Wear neat polished dark shoes that go well with the suit.
Socks:
Wear dark socks that match your trousers. Avoid bright or eye-catching socks.
Accessories:
Keep the use of accessories to a minimum. A watch and possibly a cufflink can be worn.
General maintenance:
Make sure your clothes are clean and ironed, and that you look groomed.