Since Kevin is referring to me I will be happy to jump in here and offer a few comments. I will not get into a discussion of the matter since Kevin knows full well the complete details regarding the specifics of this matter and has exchanged emails with my attorney.
The bottom line is that I have trademarked MY DESIGN for the conversion attachments that I use on my Mason-Dixon convertible OWB-IWB holsters. Again, the trademark is on my conversion attachments and NOT the actual holster, so anything that resembles, or acts in a sufficient manner to be essentially indistinguishable to mine would be an infringement. Whether Kevin, or anyone, can find an actual reference to the trademark is inconsequential at this point...the trademarked status exists and is enforceable.
Now, to the original content.....a tuckable IWB is not a new subject. Most makers, Kevin and I for two, make holsters commercially which are tuckable IWB's. As Kevin can attest, you can use another maker's design for inspiration, but directly copying is considered bad ju-ju.
And a last note, in case Kevin wants to escalate once again, my design was conceived independently of Kevin's and letter sent to him regarding my design prior to commercializing it. He referenced a design of his inspired by another maker....he took that design concept and made enough changes to call it his own. My design differed enough from the outset that I had nothing to change, however, as a courtesy I contacted Kevin after seeing his holster. The rest is history as the holster was introduced commercially AFTER that contact.