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.
Comfortable & Practical City Threads Underwear: Sensitive-Friendly Boys' Clothing
47 Review
Hanes Tagless Briefs 10 Pack Assorted
40 Review
Comfortable & Durable: Lucky & Me Noah π©² Boys Boxer Shorts 5 Pack - 100% Cotton Tagless Underwear
49 Review
π Russell Athletic FreshForce Protection: Boost Your Boys' Performance with Assorted Clothing
49 Review
π Bold Pack Sleeve Active Hoodie Sweatshirt Set for Boys' Clothing - Stylish and Comfortable!
47 Review
Funny Guy Mugs Tearaway Sweatpants: Playful Boys' Clothing for Fun and Active Days
49 Review
π₯ Stay Warm and Active with Rocky Fleece Thermal Underwear Bottoms for Boys
44 Review
Waterproof Cozy-Dry Rain/Snow Pants for π§ Kids by JAN & JUL, with Fleece Lining
64 Review