A garment can combine an outer fabric, lining, trim and detachable part with different care requirements. The complete item's instructions govern how it should be treated.
Understanding this situation
A cotton-looking shell does not establish that glued decoration, padding or a delicate lining tolerates the same wash. Removing a detachable part is appropriate only where the manufacturer directs it, not because it seems inconvenient.
A useful next step
Read the full care information before mixing the item with ordinary laundry. If a layer changes after washing, document which part was affected. This makes the enquiry more useful than saying the whole machine shrinks every fabric when the damage concerns one construction.
Manuals and supporting guidance
Model-specific instructions take priority. These references support the practical principles discussed here; they do not diagnose your appliance.