Agrypnia varia is a fairly large (up to 20mm) and attractive caddisfly with a mottled black (or brown) and white appearance and banded legs.
Its preferred habitat are sandy soils.
It is a common species in almost the whole of Europe.
It is quite similar to Agrypnia improba but has more extensive brown areas on the wings.
However, they can't be confused with each other because the latter only occurs in North America.

Caught in my self made moth trap.

1st, 2nd & 3rd photo: In my yard, Hilversum, The Netherlands, 15 August 2018
4th & 5th photo: In my yard, Hilversum, The Netherlands, 10 August 2019