Good to hear about your talk with Jody. Sounds like she still sees a lot of positives in your sitch. That is great.
I think the leopard idea would be fabulous. I just have two concerns.
1. Your H might see it as pressuring, to ML and be sexy and romantic with you. However since you would be coming home from an event it might be okay. Just wouldn't want him to take it the wrong way if he was not in the mood. Would your "expectation" here be sex? Or do you want to wear the costume because it makes you feel sexy and fun and you want to be in a happy mood when out with friends?
2. Your H might think you are trying to make him jealous or suspicious if you were dressed that way at a party with other men. I don't know. . .probably just me thinking that way. If it is something you have/would have done in the past even without him being present then this is obviously not an issue.
Just my thoughts for ya.
I think it is wonderful that he is reaching out, even in small ways, while he is on his trip. He is obviously thinking about you which is good.
Keep it up and let us know what you decide about the costume!