How to dress for the weather

I have two apps that give me daily outfit suggestions based on the weather. Style up is a great app, and their suggestions are always pretty good. But the other one called Daily Weather was okay, but recently it has lost the plot! This is what it suggest for 11degrees but feels like 8 - a light dress with short sleeves and no tights with sandals - Wtf? Today I spent the day working from home with my daughter, my aim was not to get out of my new Peter Alexander pyjamas and I achieved that!