Ok... I have a Practice Drawing sword right... It will not say in between my Belt.?

Question

Ok... I use this for my Tae Kwon Do contests. Am doing Haidong Gumdo forms. Every time I make a Small movement its falls out. In The form Am working on Now I have to spin in the Air and cut someones head off... then put the sword away... The d**n Scabbed keeps falling off. Hows the Best way beside makeing your belt tigher. (I tryed that and it works intill the Spin.)