The first one looks Victorian to me - with the long princess line seams I would have though late 1870s - early 1880s. That meandering braid decoration is typically Victorian - not Edwardian. The tiny little pleats at the hem are also typically Victorian, to create some body in the garment. I am not sure if you would call it a chemise or not because buttons are more typically found on garments worn over a corset, rather than under. Also the tiny pleats suggest they wanted this garment to have shape, in which case it would have been starched to death to help create the silhouette and you don't wear starchy clothing next to your skin - you would be sticky all day...Maggie, does the back of it have gathering or pleats like it was intended to fit over a bustle or is it smooth over the buttocks?
The second one is a classic late Edwardian chemise - c. 1910 -- those trifoliate clover/shamrock style leafy patterns are so popular in the early 20th century.