My mom is making me wear a dress to homecoming. I'm out to her, and I've expressed my hatred towards what she wants me to wear, but she said I had to wear a dress, so I got a cheap one. The thing is, I thought I could handle the dysphoria. Just one night, right? I fell asleep on the bus today and someone put makeup on me while I was sleeping. When I opened the camera on my phone later to fix my hair, I saw, and had a horrible panic attack. How do I tell her that I can't handle wearing a dress?
Sometimes the thought of something can be ok but the reality isnt, and vice versa as well. It may just be one night but I personally couldnt, and wouldnt, either. If you are out to her she should have some understanding of that. What exactly is her reasoning for you ‘having’ to wear it? Its an event for you not her so why does it matter to her how you dress. There are cis females who wear suits so why cant you if you want to. Its not that uncommon these days. You should be able to dress how you are comfortable, not forced into something you dont want which could potentially ruin the entire thing for you. Just tell her how you feel and why. She doesnt have to personally get it to respect what you want. Try to explain how dysphoria affects you like that example you just gave. Something that can seem so insignificant can have big effects on us and they tend to not understand or even really think about that. You should be allowed to enjoy the night without having to deal with that. If it comes to it though you could always leave in it and get changed when you get there if someone else could get it for you or keep it in a locker or something so you dont have to be in it all night.
I hope you can reason with her though and get her to let you dress how you are comfortable