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Might be racing under Rapha CC, so would be their 'team' kit? Also @amey is right there is no longer Cat 4 racing at CP, it's E/1/2 and Cat 3 only.
youramericanlover-
It has to be an approved kit by British Cycling which you can only do at the beginning of the year when registering the team.
You can see their approved kit on the top right of their club page
https://www.britishcycling.org.uk/club/profile/2858/rapha-cycling-clubCat 4 is the only level exempt from having to ride in approved kit.
"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."
Sumo
"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."
https://www.britishcycling.org.uk/zuvvi/media/bc_files/rulebook/2018/C7_-_Technical_Regulations_For_General_Road_Track_and_Roller_Racing.pdf