Try this pattern in shiny Japanese fabric...... it looks fantastic.
This is one I posted, if you enlarge it you can make it for your bigger scissors.
http://tipnut.com/scissor-pouches...
in case you need more for all your scissors
Sorry forgot the link - this is the one you are looking for.
I think, I kann help. The pattern is not exakt the same (rounded flap) but the instructions are what you need.
Look at the other tutorials too.
Bärbel