The look is differnt. Most Dati Leumi women wear sandals (As do the men)
Also the blouses are differnt and for the men, its very differnt. Most Dati Leumi dont seem to wear suits (Unlike the US, but MO men rarely wear hats)
I cant say about Litvish, but also chassidic seem to walk differently (At least in the US)
Its easier to tell what camp someone is in, than you think