All dwarfs received slight updates to their heads. Mostly changing the eyebrow shape. Happy received the most dramatic update; now having white bushy brows. Their beards were also updated. 

For wardrobe all jackets were updated, now supporting patches on the elbows as well as new cuffs. The buttons and belt buckles are brighter and more cartoonish. While all trousers have been slimmed down. 

Dopey received a new look that is more in line with his fellow blushy dwarfs

1980 introduced the dwarf designs as we know them today. Finally allowing the dwarfs to move their arms and interact with guests. 

Around 1996 the dwarfs could be seen with a darker blush and more even skintone. 

Around 1970 the dwarfs received a completely updated look. Still using the big-headed look. But with the new heads better proportioned with the hats. 

In 1961 all dwarfs received an updated colour pallet. However the costumes and heads remained identical. 

Following the Ice Capades costumes Disney, at some point, introduced new big-headed character costumes for the dwarfs. As Filmic Lights notes on their vintage postcard post the first postcard with the seven dwarfs was released between 1956 and 1966. The outfits feature mesh cut outs in the hats to allow the performer to see. The arms are motionless, but the face can be animated. 

The first time the seven Dwarfs appeared in the parks was at the opening day parade of Disneyland in 1955. As Disney didn't have their own costume department at this point the costumes were borrowed from the Ice Capades show.