Gym goers should wear modest, comfortable clothes that fit well and do not rub the skin. Shorts and a T-shirt are typical. For yoga or Pilates, some people might prefer form-fitting clothes that provide more freedom of movement. Running or walking shoes are fine for weight lifting and low-impact activities.
If a person goes to the gym to run or play basketball, he is better off with running shoes or basketball shoes. Socks are necessary and should fit properly. If they slide down or do not have the right thickness, they may cause blisters. Gyms also have dress codes that their members should follow.