Also I have a thing for clothing with a history, and couldn't bear for this not to be valued.
It is a sengetrøje. I couldn't find an English word for it, but it translates into 'bed sweater'. It is a traditional piece of clothing, that you would wear over your night gown. The original Scandinavian lounge wear ;-).
I opened the sideseams and the underarm seams and sewed a matching piece of fabric to each side(See how here: http://saga-i-farver.blogspot.dk/2014/11/sengetrje-reddet.html ).
I decided to remove the ties, and use brooches to close it instead. I gives a more clean look.
I wear it with my great grandmothers brooch from her national costume. I think they suit each other.
And since this is modern times, and I have central heating, I will probably wear it as a cardigan, rather than sleep wear.