Help dating flanneled plaid skirt

[196t's]

Good morning/afternoon/night to all!

Along with the purse I posted earlier, I also got this skirt from my grandmother. She says she bought it in Europe and when she came back to Brazil had a seamstress alter the skirt (I assume she had a slit open in the back). It closes with a zipper and a tiny hook that gets attached to the fabric, and is made out of a flanneled fabric, if it helps. I am assuming it dates to the 1980s?

Any help is appreciated.

 

[196t's]

Bumping this up... Any hunches?

 

[Midge]

This is really hard, as this is a very classic style and there are no labels present, honestly. Length may be an indicator - knee length, below the knee, calf length?

 

[196t's]

This is really hard, as this is a very classic style and there are no labels present, honestly. Length may be an indicator - knee length, below the knee, calf length?

Of course! Sorry, Midge. It's a very long skirt, ankle length.
Edit: I just remembered: My grandmother said she wore it very high, up to her waist. Still, a long skirt. If you'd like, I could photograph it in a dress form.