I'm a guy in my late 30s and will be in Madrid in May and June. I'm trying to figure out what clothing to pack that is climate-appropriate, age-appropriate, and won't make me stand out too conspicuously as a foreigner.

I'd like to bring clothing from home rather than buy it there, partly for financial reasons and partly because it's hard to find off-the-rack clothing for the "vertically challenged" in Spain.

When I was in Barcelona, I noticed that adults don't usually wear jeans and sneakers. My limited experience with Madrid suggests it's a more informal place. Any suggestions?