A lot of people don't like the Uncle Mike's holsters, but I discovered that their IWB holsters also sell (except for one size) with a retaining strap of velcro. I'm currently using the UM holster, #1 fits the Ruger LC9 very snugly.

I just cut down the retaining strap which overlaps quite a bit.

I wear it inside the belt, but outside the waistband of my pants. Easy to put on and take off and you can even get a bit of forward cant with it.