Fashionable and freshly-ironed to be sure, but jeans nonetheless. Ed is usually a more comfortable in chinos, but occasionally wears jeans also. Popular or not, jeans are heavy and bulky so not really ideal for travel. On the other hand most hide soil well and wrinkles seem less noticeable. Dark slacks, perhaps tweed, perhaps not.
Dark trousers are more common than jeans, which are more common than chinos.
Relatively dark sweaters with lively patterns and highlight colors seem popular. Perhaps a cardigan for cool evenings or 'dress up'. Even then, an inexpensive blazer will do the trick. For us, most clothes from specialized travel suppliers are overpriced and not all that advantageous over what you can purchase elesewhere for less. Buy wisely and little, and save your clothing budget for a good pair of walking shoes and protection from rain, wind and chill.