A mustard shirt can be paired with a variety of colors for jeans and shoes, depending on the occasion and personal style. Here are a few options:

1. Dark blue jeans and brown shoes: Dark blue jeans create a nice contrast with a mustard shirt, while brown shoes complement the warmth of the color. This combination can be dressed up or down, making it versatile for a variety of occasions.
2. Black jeans and white sneakers: If you want a more casual look, black jeans and white sneakers can create a nice contrast with the mustard shirt. This combination is great for a weekend outing or a more laid-back occasion.
3. Light-colored jeans and loafers: Light-colored jeans, such as beige or white, can create a nice contrast with the mustard shirt, while loafers add a touch of sophistication. This combination can work well for a dressier occasion.
4. Grey jeans and black boots: Grey jeans can create a nice neutral base for a mustard shirt, while black boots add a touch of edge. This combination can work well for a night out or a concert.