YEING silk fibers requires high heat, which damages the properties of the fibers. Today, the use of natural dyes is a solution to this problem. Dyeing, finishing and seam parameters are an important characteristic which affects the performance and durability of clothing during its usage life. Stitch density one of the most effect on the durability and appearance of garment, may be affect in opposite direction on the sewing machine speed. So it is important to study the better condition of sewing. Effect of two levels of seam stitch density are studied on the silk fabric garment properties which dyed with Eco-friendly Dyeing onion peel dye.To analyze our results statistically, we used analysis of variance (ANOVA). The multiple linear regressions modeling is used to determine the influence of the different concentration onion natural dying, fabric parameters and stitch densities on silk garment properties.