2 questions on this subject, answered from our own work, with the numbers.
Yes. Dubit tests children's TV shows, apps, games and toys with children in its own PlayLab. We tested one television pilot there with children aged 5 to 8 and their parents. The tests were there to measure their reaction to the pilot and to support the pitch to TV channels and streaming services.
Dubit asked 47 young people aged 8 to 18, half of them Roblox players, where they buy their clothes. All of them had downloaded retail apps and browsed them routinely for looks they liked, and each age band shopped its own way. The Roblox players were much more likely than the non-players to buy in the app rather than go into the store. The ones who dress an avatar online may simply be the ones already used to shopping online. This is qualitative research, so it describes how they shop, not how many shop that way.