I found some screenshots - bear in mind this is from 2012 :)
It was a simple Android app that accessed the user's approximate location (no need for fine GPS location) and got weather data from some weather API (can't remember which one, maybe OpenWeatherMap?).
You could open the app and it would suggest what to wear based on the current weather. Or you could receive a notification when the weather would change, saying smth like "Don't forget to take your umbrella with you" :)
Hope this helps :)
That's awesome (and also very early 2010s :D )! I'll add a shoutout to you in the next edit!
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