The brown stretch poplin of Paris Bark will fit the bill for slacks, a jacket, and a matching bag that you can embroider. Sew this like you would any other medium weight woven.  You just get to enjoy the built-in ease the spandex provides. 

VF232-03 Paris Bark - Brown Stretch Cotton Poplin Fabric

• 95% Cotton, 5% Spandex
• 49" wide
• Cold wash, dry low
• 10% crossgrain stretch
• Priced per yard

This fabric is featured in the Vogue Fabrics Catalog - Spring 2023 issue.  See the related items for color-coordinated match mates to complete your fashion sewing ensemble.  You can order catalogs with the swatches included so you can feel the fabrics an see the colors.