Questions about dresses bought at estate sale no. 2

[Aimee]

hello all, recently came across a few dresses at an estate sale, i'll be posting the rest of them shortly. i was told that the woman had been 100 years old, i believe the clothing belonged to her. hoping to get some input on dating it each piece, along with any notable fashion terms i should know about the garments. any help would be much appreciated!

has tags
plastic zipper

 

[northstarvintage]

Another cutie - so wearable! I see 70s with this one too - sundress is a good search term.

 

[bycinbyhand]

Act I is 70s

 

[Aimee]

thank you, everyone!