As hot as it gets here in North Central Texas, conceal carry can be somewhat of challenge at times. I rarely ever wear a vest in the summer too that I can conceal in the inside vest pocket. More often than not I put my XDm9 inside the right rear engine guard leather bag by my leg. I do have a couple oversized tees that I can put in the paddle holster that came with my XD and not worry about imprinting the outline while riding. More often than not with my wife on the back, her right leg blocks any view of my holster.
Fall and winter time its much easier to conceal.
I'm also a Harley rider and pistol packer but my home is up in the rust belt. Wondering how do you carry in the summer there? Can you open carry? I'm looking for a way to carry a .45 concealed while only wearing a t-shirt/vest. Here it don't matter if your piece shows so long as you have a CPL you can carry it almost anywhere but some states don't like for your pistol to show at all.