I did some googling, and doesn't look like anyone's drawn Moomins in Finnish folk costumes. I guess it could be because the costumes are so regional - you'd have to decide which character matches which region.

I've watched a few episodes of the new series, and I don't like it. It's pretty, but it's a bit too busy for my taste. I think small children will like it, because it has similar kind of humour as a lot of contemporary children's shows, but for me it lacks the calm beauty of the (first few seasons of) the 90's anime.

(and the felt moomins. I'm sad no-one ever remembers the felt moomins :D)