Stick to neutral colors such as black, white, gray, and beige. These colors are classic and timeless and won't distract from the subject.

Keep the outfit simple and understated. Avoid bold patterns, graphics, or logos that could draw attention away from the subject.

Play with texture: Use different textures to add interest to the outfit. For example, a knit sweater paired with a cotton skirt can create a subtle and interesting contrast.

Mix and match different pieces to create a cohesive and neutral look. For example, a white blouse paired with black pants can create a classic and sophisticated outfit.

Use accessories sparingly and stick to simple pieces such as a delicate necklace or a pair of stud earrings.

Make sure the clothes fit well and flatter the subject's body type. Avoid clothes that are too tight or too loose, as they can be unflattering in a portrait.