I'm fortunate enough not to have to deal with a SO.
However, it IS widely reported at this watering hole [by both CDers and/or their SOs] that "give a CDer an inch and they will almost always take a mile."
Shame on the CDer for this and also the SO to allow this. Being in Love does not demand that we let our partners "be themselves" and/or break any agreements/boundaries or limits.
I think it's often forgotten here that for most with SOs [widely reported] it's not/seldom enough to "just' crossdress at home. They want at least a few female "tells". Forms, wigs, shapewear etc.
No Rocket Scientist needed to guess that few women are going to be OK with it and that far more would likely tolerate it if it was ONLY the clothes. It's also highly likely they would have less problem with flats and granny dresses than with 6" spiky heels and minis.
