In response to your requests for help. I can speak from a first hand experience here.
Firtsly understand that it is not the Garment so much as your interest in it that frightens her.
You have to be open and honest and discuss this properly. There are now
tights (
pantyhose) that are marketed purely for men. There are sites and blogs dedicated to this subject. Use you search engine to locate what ever info you can find, and enter the discussion happy with knowing that you are far from alone. Show her the Sites that deal with this and possibly purchase a pair that are purely for men.
I suspect that it is becasue Society says that it is taboo for Men to like the look and feel of certain Garments that partly spooks your Partner, combined with the fact that the same society that dictates what people have to think also dictate what they have to wear. I can understand that she may have reservations, but talk it through honestly and simply and one by one knock down the barriers that are in your way. You are not Gay, you like the feel, you like the look, you feel comfortable, sexy, naughty, what ever Tell her the truth.
In reallity as i have said previously on this site They are only Clothes, that is all they are, and it is society that says that is not acceptable for Men to wear them.
It is fine for Men to wear them, it does not alter the person wearing any more than your Wife Becomes more masculine if she slips your Boxers and best shirt on in the Bed room.
Keep chipping away, and you will get there, and trust me its worth the effort when you do.
Look on Geraden's Blog, and look up Gerbe
tights for Men, and also a site called Petticoated.com.