This Closed Wings are a Saddle.
You can't use a Saddle and the wings.
The reasons for this is, that there is not enough Texture space for new objects. So I had too choose between no saddle or a very low texture that will look terrible.
I really hope you like it!
There a two wings in the set. One has a small gap you can find it in the riding outfit the other one will show up in the daily outfit with no gap. You can still unlock them in the catgory but with this option you don't choose per accident the wrong position of the wings.
Update: Now also Fouls can have wings. The second thing that I changed is, that they will not automatically added to your horse when you create it.
I also create a open Wings: