Okay, baked/jacket potatoes. Or ...potatoes in their jackets/potatoes in their robes?

In French they are "en robe de chambre" and the lady says she's going to put hers ( her "robe de chambre" ) on.
That's the problem with these works. We lose half of the puns in translating.

he already said "potatoes" in U 67 . potatoes, not pasta.
and now they're talking of different way of cooking them
https://www.bbcgoodfood.com/howto/guide/how-make-ultimate-baked-potato
"baked potatoes" is the usual name for that recipe for which you don't peel the potatoes. They are sometimes called "Jacket potatoes".

Do we need to link the potatoes and the dressing gown?

Why not just potatoes?

? Do you think if we choose "jacket", we could alter the next sentence a bit to keep the link?
Something like:
I'm going to take mine off, put a bathrobe on and I'll be with you in a jiffy.
Unfortunately she was wearing a raincoat :-(