I think Sim 3 should be rebuild...which means you can save the patterns into the game without using Upload, Exchange, Export...Sim 3 official page is gone then all Sim 3 player cannot use new patterns for the game.
You can install them in your game without uploading to the exchange.
1) Export the pattern.
2) Navigate to the My Documents folder on your computer.
3) My Documents > The Sims 3 > Exports
(something like that. I'm on my phone and don't have my computer in front of me.)
4) Double click the file for your pattern. The pattern will install into your game.
When I was making t-shirts in the game, in this how I would make some the graphic was in the right place.
Comments
1) Export the pattern.
2) Navigate to the My Documents folder on your computer.
3) My Documents > The Sims 3 > Exports
(something like that. I'm on my phone and don't have my computer in front of me.)
4) Double click the file for your pattern. The pattern will install into your game.
When I was making t-shirts in the game, in this how I would make some the graphic was in the right place.
(no ts3 wishlist, because I own the store)