According to Official Guinness Records,
The most brands advertising on a single sportswear item is 112, and was achieved by Pamela Dickerson (Australia), at Tour de OROC, in Dubbo, New South Wales, Australia, on 2 October 2017.The single sportswear item chosen for the record attempt was a cycling jersey.
For a complete list of 2017 records, please visit 2017 Guinness Records in Australia.