The pattern on the EBay ad is the Simplicity # 5029. Of course they don't tell you that.
The pattern was discontinued about two years ago. It looks like someone bought a ton of them and hopes to make a buck.

I tried to use this pattern for a jacket when I was trying to release our Kilt-Cut Sport Coat and found it OK, as far as it went. You should be VERY good at making mens coats however to make a decent jacket from it.

We ended up putting the pattern back into the drawer and starting from scratch.

The kilt part of the pattern is total crap and should be used a tinder for your wood burning stove.

As far as using it for a leather jacket...Good luck.