Just a quick update - we've been testing a huge variety of fabrics - we're measuring moisture to gauge how fast sweat will dry at various periods after being soaked in water.
An important realization is that some fabrics, those that are hydrophilic, absorb water and those that let is spread the furthest, the fastest, give the water more area for it to evaporate and dry. Those that are hydrophobic, which don't absorb the water, but rather let it sit on the surface and bead, dry super slow. Also, the hydrophobic fabrics create essentially a barrier for the water to escape, so it sits inside the shirt, feeling super wet and nasty. Also, different fabrics feel very different when they are wet, or have retained moisture, some feel soggy and gross, while others feel cool and dry.
More testing to come!