I agree that there is no need to wear black to a funeral and no need to have a specific style of dress. But I think the off the shoulder nature of this one makes it not OK.
Like I and others have said – plain dark trousers, plain or low-key patterned top, dark coat, low boots, done.
Agree re heels actually – not a good idea. Even if it’s the crem, there's an awful lot of standing about at a funeral. Comfy shoes are the way.