Engineer helmet over my hat!

[Vlad]

I work according to your instructions. All was well until making hat for classes without a standard cap. Now I make a hat for the engineer. And so it began. The problem is perfectly visible in the screenshot. For example, here I put the usual scope of arbitrary tecture. I've tried everything with bones (probably), reviewed both of the guide, but nothing could change. Standard helmet engineer does not want to disappear. Help, what's the problem?

>>> SCREENSHOT

[Mopo]

You need to uncheck the 'hat' bodygroup in the importer, to make the helmet disappear.

[Vlad]

@Mopo ,if you do not mind, could you show me in a blender - a picture, please. Simply, I think I've tried everything over the two days.) The head explodes...
And thank you for your attention to the issue.)

[Mopo]

http://imgur.com/cPn06wb

[Vlad]

@Mopo , thank you very much. I'll try it. Please tell me where I can test their items except "itemtest"? Can it be done on the game map TF2? I want to see how the item will be combined with the gaming environment.