Can I get away with wearing jeans?

Absolutely not. Denim is heavy, takes days to dry, and provides zero insulation when wet. Use synthetic hiking trousers that are wind-resistant.

Do I really need expensive gear?

You don't need the most expensive brand, but you do need the right function. Ensure your outer layer is rated 'waterproof' (not just water-resistant) and is seam-sealed.

How to dress for Patagonia's four-seasons-in-one-day weather

Dress in three distinct layers: a moisture-wicking base, an insulating mid-layer, and a windproof/waterproof outer shell. Patagonia's weather changes every 30 minutes, so you must be able to add or remove clothing without stopping your trek.

Master the base layer. Wear a synthetic or merino wool base layer against your skin. Avoid cotton entirely, as it stays wet and will cause you to lose body heat rapidly if you sweat or get rained on.
Pack a versatile mid-layer. Bring a lightweight fleece or a packable synthetic down jacket. This keeps your core warm while allowing breathability during uphill hikes.
Seal with a technical shell. Invest in a high-quality, seam-sealed waterproof rain jacket with a hood. It must be windproof; Patagonia’s legendary gusts (up to 100km/h) will cut through non-technical jackets instantly.
Protect your extremities. Carry a pair of thin liner gloves and a warm beanie. Even in summer, you will want these when you stop for photos or take a break at high-altitude mountain passes.

Can I get away with wearing jeans?: Absolutely not. Denim is heavy, takes days to dry, and provides zero insulation when wet. Use synthetic hiking trousers that are wind-resistant.
Do I really need expensive gear?: You don't need the most expensive brand, but you do need the right function. Ensure your outer layer is rated 'waterproof' (not just water-resistant) and is seam-sealed.