Hunting From Tree that Skylines You

No other tree? Gun or archery? High enough? Higher than needed? Woods or food plot? Corridor or destination? It all matters because you can’t be moving in some of those situations with a bunch of eyes around you.
In my opinion it doesn’t really matter about the camo in a skyline situation. I wear Sitka once the leaves fall and bottom land for early season, though.

Be still and make sure you can see far enough to get ready for the shot regardless if you want to shoot the animal or not.
“Far enough” only means that you can tell a deer is coming, but you might not be able to tell what it is. Not a huge opening.(In woods/corridor)
If in a destination type area you better be ready to go once the first deer gets there. I’ll stand once I see the first deer come into a food plot with a bow and get a gun in my lap if using a gun.
The key is minimal movement. And keep as much movement as possible tight to your body. Don’t go sticking your arms out reaching for stuff, pointing, or swatting at bugs. Keep everything as tight as possible.

Get on the backside of the tree.

If you're skylined I don't think the camo pattern is going to make a difference. I'd wear a leafy/ghillie suit to try and break up my outline but I try to avoid trees like that.

If that tree was my best option, I would put on a saddle and hunt from the back of the tree. Get some good knee pads and try and stay still.