For instance I would much rather wear 380g pure Irish linen than 280g silk in the climate which you are suggesting.Silk is not a breathable fabric and wears warm. It adds softness and structure but doesn't perform well in humidity. I find that pure fabrics (either tropical wool, linen, or very light cotton seersucker) perform best under true tropical conditions. Even wool, silk, linen blends of the weight you suggest can wear warm, depending on the amount of silk.