Ten articles of clothing to take on an impromptu trip

Useful if it gets chilly, could fold up for lumbar support on plane, make pillow in hostle/bench, etc

Always appropriate, everywhere

Comfort and style

Don't go commando

You might want to go for a run, roll jiu-jitsu, etc

Swim, surf, work out, train jiu-jitsu

Around the house, beach, streets, comfortable and stylish

Warmth, comfort in shoes

On or off-road. Appropriate for many contexts.

Keep the sun out of your eyes, pull down over face to nap.