• Here we go, from BC rulebook.

    8.1.2 When competing under these Regulations riders (other
    than as provided in T.R. 8.1.8 and 8.1.9) shall wear
    Club or Region registered design and colours, as is
    appropriate.

    8.1.9 In Road and Track events, Youth, Fourth and
    Provisional category licence holders and BC non
    licence holders will be allowed to wear any suitable
    clothing whilst competing in events under the
    Technical Regulations of the Federation, including that
    bearing registered or unregistered advertising except
    in the case of National Championships when they
    must comply with T.R. 8.1.1 to 8.1.6. However
    protective headgear must be worn.

    So, you can wear what you like if you're a fourth cat or provisional.

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