The Spa-Francorchamps circuit safety has tightened its security requirements since August 2018. From now on, driving on the track is only permitted with long clothes covering your arms and legs. So no short-sleeved T-shirts and no shorts like shorts and Bermudas.
You can also find information about recommended clothing in our Trackday 101. Please understand that we have no control over this decision and are encouraged to support the control of the track