You don't have to wear the burka and you don't have to wear dark clothing either. People who do this, do it culturally.
Wearing a hijab or scarf is enough, your face and hands can't be covered. Your face is for Allah, so don't cover the face.
If you wear loose, comfortable, modest clothing and appropriate for the weather is what you should do as well and is enough.
You don't need to wear extra clothing or overbearing clothing that is a struggle for you because of the weather, you shouldn't put your health and your body at risk for heat stroke or other health problems. Unless if its colder then you do need to dress comfortably and heavy clothing that will protect you from the cold.
Just be practical about your clothing and modest. And if you want to beautify yourself, you can. No one said you can't beautify yourself. People love beauty.
Allah loves beauty as well, Allah appreciates beauty and Allah appreciates even more when you beautify yourself for Him especially when it comes to praying. You would want to be presentable, clean, refreshed, fragrant and beautiful for Allah.
You can wear stylish, modest, comfortable clothing when you go out. You can wear ornaments or jewelry, etc. You just need to be practical and what's appropriate regarding for any occasion or when it comes to the weather.