When looking at the whole set of Red Riding Hood, you can clearly see that the hooves are not working:
Now let me make things complicated by taking a look at my inventory, showing all Red Riding Hood traits I possess. Looking closey you'll notice that there are two hoove-traits, an elder one and another, newer one next to the background that was a Vintage trait some time ago. And the clue: the older version in the database does work!
Same goes for the Skeleton Spirit. The traits are in the database twice. With an older ID and a newer one. Some admin uploaded those traits a second time without knowledge that those traits were already existing. Therefore some sets are not shown correctly, due to some wrongly linked traits. I doubt it'll be fixed soon, the bug is already known since two years and a couple of months... nearly three years by now. *coughs*
I advise you to only buy traits that work - check them out in the store first, place them on your pony to see if they show up correctly. :)