16 May 2016 Last updated at 06:45 BST
The athletes will wear the outfits at special events at the games in Rio this summer.
Children across the UK were asked to send in their messages of support for Team GB and then 10 of the best were chosen.
Leah was at a special photo shoot to meet the athletes wearing their new gear.
This report contains some flash photography.
Team GB have been showing off their new suits that have good luck messages from children printed inside.