Yes, wearing vintage fur is one of the most defensible positions in fashion. Extending the life of a garment that already exists is fundamentally aligned with circular fashion.
Your shearling needs three things: regular brushing, proper storage, and occasional professional attention. That's the entire framework for how to care for shearling—everything else is detail.
Most people need 2-4 winter coats to cover the full range of cold-weather scenarios—daily commutes, formal occasions, extreme cold, and transitional days.