Vintage 60s Tennis Dress, amazing

This cream tennis dress is by Canadian Maker Leberg. It's a real stunner: the material is difficult to say as there are no labels, it has a soft but firm canvas feel to it.
There are beautiful torteshell type buttons, but alas one is missing, so I have included 4 60s white buttons. The front is darted at the bust, side and down to the waist. also fashioned at the back with darts to the waist.
underarm is clean, but there are a couple of tiny snags under one arm, not a rip.
the skirt is pleated, permanent pleats, the back has a slight rust mark which is barely noticeable. There is also a mark where one of the front buttons slips under the placket. Again, not really noticeable
I have not washed this, marks may come out in dry cleaning or otherwise.
The marks do not really show and certainly don't detract from a lovely item.
Measurements.
Model is size 10
Pit to pit is 18" laid flat
waist is 15" laid flat
complete length is about 30 inches.