Welcome Takano -
I wanted to answer, but I"m not sure what you meant.
There is a post or two in the begginers FAQ about what everyone should have in their bondage bag.
Are you talking about restraints, suspension stuff, collars, hoods, arm binders, floggers and slappers, fashion?
You may want to go to a place like stockroom or just search for leather bondage gear and follow up here.
Hope this helps.