Yes, leggings are absolutely acceptable in Portugal for casual wear, sightseeing, and exercise in 2026. Portugal has a relatively relaxed dress code compared to more formal European neighbors, especially in tourist hubs like Lisbon, Porto, and the Algarve. However, there are a few peer-to-peer "best practices" to keep in mind. While leggings are fine for a day of walking the tiled streets, they might feel a bit too informal for an upscale dinner or a high-end fado house; in these cases, locals tend to dress up slightly more with jeans, slacks, or dresses. Additionally, when visiting religious sites like the Jerónimos Monastery or the Sanctuary of Fátima, it is a sign of respect to ensure your attire is modest. For 2026 travelers, the "athleisure" trend is widely recognized, and you will see many locals and tourists alike wearing leggings, particularly with sneakers for navigating the famously steep and slippery "calçada" (cobblestone) hills that define Portuguese cities.