My summer wardrobe consists of solid color T-shirts and polos. I've never really liked plaid shirts . Last year, my wife bought a striped polo for me and it was the only one in the closet.
In the summer, I have typically carried a Kahr PM9 or a Glock 33 in a clip on Kydex IWB worn just to the right of the zipper, hides well under those loose fitting solid shirts. I could never wear a IWB strong side or the gun would print against the solid shirt when I leaned over.
A couple of weeks ago I saw a comment about plaid shirts being good for concealment.
Reluctantly, I purchased a couple of plaid button up shirts. The difference in how noticeable any little printing is with the plaid shirt versus a solid shirt is amazing . I'm able to wear a Glock 38 (45 GAP same size as the 23 or 19) strong side IWB; I can lean over as if getting a drink from a water fountain or putting something in a shopping cart and the pistol isn't noticeable.
Plaid shirts, I'm getting more!