T-shirts are great for half-tucking too, as long as they're slightly oversized. A fitted t-shirt doesn't achieve the same look. The before picture looks good, I think, but the after picture has a whole different feel after the half tuck is added. It feels a little looser and relaxed, and makes your outfit say something, rather than just being blah.
Pull your sweater tight and flat at the hem with your hands. Barely tuck it in to the top of your jeans, making sure the fabric is completely flat, and the top only gets tucked about an inch under the waistband. Blouse your top gently to make the top billowy and loose. This will achieve the easy, carefree look
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