Gymnastics clothing has really improved since 1914!
Acrobatic athletes should wear tight-fitting clothing without pockets.
Baggy clothing is OUT. It is not safe.
From a coaching point of view, it is far easier to assess technique and “line” when the athlete is wearing tight-fitting togs.
In fact, training without a shirt has become part of the “culture” of Men’s Artistic Gymnastics. It’s almost a coming of age ritual when competitive male gymnasts start taking off their shirts in the gym.
Gymnastics Coaching.com 