Ship modules you added to your ship bought with aUEC in game.
Weapons that are in your hand. Including weapons bought through the website as in subscriber edition items. I assume you will get these items back when the database resets for large updates in the future. I also assume you will be able to insure any item bought with real money on the website and appears in your Hanger online.
You DO NOT lose weapons not in your hand. So if you holster your weapon before dying, you will not lose it.
You DO NOT lose your armor.