When I’m looking at a garment, the first thing I do is rub the material between my fingers to see what it feels like. Then I check the care tag to find out what the fabric is made from.
I do this because I can tell how a garment made from natural fibres like cotton, linen, wool or silk will breathe, or provide warmth, based on the composition of the fibres, the weight of the fabric and the density of the knit or weave.