Jacket drawstring adjuster and accidental discharge has been known for years and chief of Connersville, IN police is the latest victim. The news is a bit exaggerating but it is something to think about.
A lot of jackets have such adjusters and unless you are really using them it is a good idea to just cut them out. The strings can be attached together by other means. If not, you can use a duct tape but it probably won't survive fashion police's scrutiny.
The best way would be to clear your garment away from holster as much as possible. No one won shooting by doing the fastest reholstering.
From: WRTV6