Unknown brand. Unknown sizing, but fits like a small. This tank top is super comfortable and airy, but is quite see-through, so you might consider wearing something else under it. As pictured, you can see my hand through this tank top. I believe I purchased this from SHEIN, but I’m not 100% sure. Cat-friendly home. 10% off bundles! Most have reduced shipping. Open to bundle deals 💕 #unique #alternative