There are two things that could affect your character's gear options besides level:
Class - there are five classes in P101, and they will have some gear that only they can wear.
Armor - certain classes can equip certain kinds of armor. I know for sure that Swashbucklers can equip light armor, and Buccaneers/Privateers can equip heavy armor. I'm pretty sure that Musketeers/Witchdoctors can't equip armor and have to go with armor-neutral clothing, but I'm not sure.
I have a few weapons and clothing on my back pack. I can't use and they are better than the ones I can currently use. I'm level 10 what can I do and none of them say a higher level is required!
There are a few possibilities: 1. They are higher level, which in your case isn't the problem. 2. They require a talent to be learned, some staffy weapons will require you to learn staffy weapons 1 and or 2(from vadima), or choppy weapons 1( from mordekai). 3. Some require either light armor or heavy armor( from mordekai or the commodore, NOTE: heavy armor cannot be learned by any other school besides buccaneer and privateer. 4. It might simply be a school retricted item.