Tom,
Any Alpinestars suit should be fine. If you want to be sure just look for the CIK-FIA stamp on the back of the neck.
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2.8. Safety equipment
For RMC overalls, helmets, kart shoes, gloves and other kind of driver protection must comply with the regulations of the national Federation or CIK-FIA.
For IRMCE and the RMCGF article 3 of CIK-FIA technical regulations apply.