Pieces of the shirt appear at the elbow of the R15 avatar every time I walk. How can I fix this?

https://preview.redd.it/unos0fn6svtg1.png?width=1356&format=png&auto=webp&s=3751cbdf39f3786c01fceffae207a04c303d5c47

https://preview.redd.it/nbmqqbn6svtg1.png?width=832&format=png&auto=webp&s=4e169e07cab9fa472c9fe4ef4a69f02fb70478c0

Does anyone know how to fix this bug where small pieces of the shirt appear around the elbow area on the R15 avatar?