At first, I was not all that keen on supertucking my supertuck. I went to a funeral and was wearing a suit, the gun completely disappeared when I tucked it. There was no wierd unblousing. It was impossible to see it. I was so impressed I walked past the two motorcycle cop/escorts with my jacket off and they had no clue. I even said hi to them to be sure they saw me.
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The next day at church I wore a sweater that I knew was not long enough to completely cover so I tucked my t-shirt over the set-up. Bam! It was gone. I loved my supertuck before. I really love it now.
If you are going to be kneeling or contorting, that may be the best thing. Tuck you t-shirt over the gun. Put on a wife-beater if you don't want anything touching your skin.
Hope that helps.