We've had a few warmer days recently so I've been able to make a prototype of this little pouch.  Isn't it cute?  Perfect for carrying round a small tatting project.
I am going to slightly 'improve' on it when I make more as I think the flap could be a little longer. 
The inside pocket is stiffened with iron on interfacing and the outer has iron on batting/wadding.  This prototype will have a press stud to hold the flap down (when I get roundtoit) but in future I think I may sew a small piece of elastic into the flap and use a shank button on the outside. 
This improvement (hopefully!) comes from the fact that I know me too well.  I tend to try and stuff too much into everything (including life itself) so it may need a little 'give'. 
If these prove successful then I'll make some to sell.  I still have my Etsy shop.