For a comfortable journey on Amtrak in 2026, the "Golden Rule" is breathable layers. Train cabins are notoriously unpredictable—one car may be freezing due to high-powered AC, while the next feels stuffy. Wear high-quality "athleisure" or soft trousers with a cotton tee, and always bring a hoodie or pashmina that can double as a blanket. Avoid tight jeans or restrictive belts, especially on long-distance routes like the California Zephyr, where you'll be sitting for many hours. "Pro-tip": The air on trains can be quite dry, so wear natural fibers like merino wool which regulate temperature and resist odors. If you are traveling in a Sleeper Car, pack a pair of clean, non-slip slippers or "house shoes" so you don't have to put your boots back on for midnight trips to the restroom. In 2026, the "smart-casual" look is standard in the Cafe Car, so as long as you prioritize comfort and flexibility, you'll blend in perfectly with seasoned rail travelers.