BeeButts

Great photo! App says it’s a European wool carder bee. I’m not familiar with these little cuties!

https://en.wikipedia.org/wiki/Anthidium_manicatum

They get the name "carder" from their behaviour of scraping hair from leaves[4] such as lamb's ears (Stachys byzantina). They carry this hair bundled beneath their bodies to be used as a nest lining.[5] Like other members of the tribe Anthidiini, these bees do not cut leaves or petals as is typical for megachilids.

I'm in northern Germany and haven't seen a single one, a few bumblebees and had a large wasp nest near my door last year but they seem to have died over the winter, planted more flowers for them this year but still no sign of them.