During hot summers, the general guidance is to keep them cool but covered from the sun. If you are filtering sunlight anyway, you don't need to worry so much about coverage from the sun, so clothe them in enough layers they feel comfortably warm.
As an example, in a hot Scottish summer (25 degrees C or more) we would just put a vest, a sun hat and a nappy on our babies, and give them quite a lot of time with no clothes at all. But in the evening we would add a blanket or layers. I would imagine that growing up in 45 degree summers would mean you and your child would require many more layers here, so you need to tailor the clothing to the individual, not necessarily the absolute temperature.
They will let you know when they are uncomfortable, and you will rapidly learn what their cry is for too hot, or too cold. This is an aspect new parents often worry about, but babies do communicate quite well, with different cries to let you know what they want.