The trick to choosing your wardrobe is to make sure that your outfits are not too busy. I suggest choosing one or two patterns and adding solids and textures that compliment your color palette.
Textures add dimension and beauty to your photos. I love adding dimension to outfitting with textures, and I suggest that you add multiple textures to your portrait wardrobe! Some textures I love are lace, corduroy, knits, chambray, gauze, crepe fabrics, velvets, Swiss dots, and waffle knits.