Super cute funky overalls! There is no tag so its a little hard to tell the fabric. I would say its a very light flannel blend. Easy to wear for the spring! They also seem as though they are handmade, I would say from the 70s. 

Size M 

My measurements for reference- 29" waist,  34 D, 5'6. These hit me at the top of my feet. 

Hanna is 5'6 and wears a size 6/8 + size M 

Please keep in mind these vintage and second hand pieces have lived many lives. There may be some imperfections here and there. Anything major will be mentioned.