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I regularly carry either Kimber Ultra or Ruger P95 OWB with a tee shirt and don't have any problems. Both of those are larger than your Glock 26 Just use a tee shirt that is a size or two larger than you would normally wear.

You also want to consider pocket carry. A Glock 26 will fit in your pocket if you have big enough pockets. Probably won't fit in jean pockets. I often pocket carry and the key is to get pants/shorts with big pockets, generally cargo pants of one kind or another.