I like to tuck in only the front of my collared shirt. I also make sure the shirt is pink, shows off my biceps, and the collar is flipped up. I also have a large belt on and some sandals. My hair is very spikey with mousse, too.
I don't think I've ever tucked in a shirt while wearing jeans in my life. Same with shorts. Of course I don't wear t-shirts with slacks, so I guess my answer would be NO.
I always laugh in my head when I see a guy tuck in a tshirt esp if he isn't wearing a belt. Tucking in a tshirt in jorts is just classic!
I saw a pic of myself from about 8 years ago and I had a t-shirt tucked into khaki shorts. I tore up the picture immediately because I didn't want that getting out.