衫

Left clothing radical, the side-form of 衣, picturing the collar and sleeves of a garment. It supplies the meaning: 衫 is a garment, specifically a light upper garment — a shirt, blouse, or thin robe. The radical anchors a wide clothing family: 袍 (long robe), 裙 (skirt), 裤 (trousers), 袄 (padded jacket), 被 (quilt).

Right 彡 supplies the sound — exact match shān with no drift. 彡 itself depicts three short slanting strokes representing fine hair, ornament, or decorative pattern. That 'pattern, ornament' image lends a faint semantic flavour: a shirt, often the most decorated layer of clothing. Same series: 衫, 杉 (fir tree), 衫 contributes to the patterned-shirt picture.