I think you should keep regulerly contacting you psycologist aunt.
Especially if she is the only family member you can aprach this subject with at the moment.
Fuuny, I was invited to a wedding, And I said Id rather not, ofcouse they asked why not, And I said I dont think I would be welcome.
When They asked what made me think that, I told them what I would choose the wear.
Fortunatelly, they said, well your invited regardless, It is MY wedding and I invited you, If other people dont like it, They aint welcome.
Did this person spacifically say, you couldnt wear the gender suit you want to, or are you assumng that they think you ment the oposit suit to the one you ment?