We've worn them solo and under shirts for every extra layer, and they work well with both. My first experience with Brix was their tank tops and the same deal I wore solo and under a sweatshirt in the summer when it got cold. I love that they have no tags and the material is stretchy and very soft for my boy's sensitive skin. The size is also included. They seem to be a bit longer than regular shirts and it also suits my boy's long torso well. I would recommend - and it's rare.
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