expression, na-adjective
gauzy; like gauze; sheer
Describes something thin, light, and translucent like gauze fabric. Often used for fabrics, curtains, or delicate visual effects.
紗のようなカーテン越しに、柔らかな光が差し込んでいた。
Soft light streamed through the gauzy curtain.
彼女は紗のようなドレスを着て、とても優雅に見えた。
She wore a sheer dress and looked very elegant.
薄い is a general adjective for 'thin' (objects, liquids, colors, etc.), while 紗のよう specifically evokes the light, translucent quality of gauze fabric.
透ける is a verb meaning 'to be see-through' or 'to show through', whereas 紗のよう is a simile describing the gauze-like appearance.
紗 (しゃ, 'gauze' or 'silk gauze') + の (possessive particle) + よう (様, 'appearance' or 'like'). Literally 'like gauze'.