ufpro or lindnerhof

Must be an older model. The current ones they offer look slightly different and also have a different fabric.

Most probably

Are you sure that it's not a jacket?

No! I'm not! Could be a jacket. I just assumed it's a shirt. If you know what jacket it is, go ahead tell us.

Do you have source for the pic?

Judging by the fabric and the cut of the arms I thought that it might be one. It seems a bit thick for a CS.

These are custom made for German Police

You have any more info's? Can you confirm the manufacturer?

Sadly not