Components in this compound:

kulnu

x₁ [mass of ideas, customs, skills, arts] is culture of nation/ethos x₂ (mass); x₁ is ethnic.

bartu

x₁ is on the outside of x₂; x₁ is exterior to x₂.

creka

x₁ is a shirt/blouse/top [upper-body garment - not necessarily sleeved or buttoned], material x₂.