Any lolita tips for hot weather?

Hello! I'm fairly new to the fashion and have been buying more and more pieces lately, although I did notice something that is very on theme with lolita fashion, and that is the usage of layers to achieve very cute looks. In my country it's currently getting hotter and hotter (around 40 degrees Celsius) and I've been worried about how I can use my pieces without feeling like I'm overheating.

Does anyone here have tips for that besides wearing short sleeved blouses? I'd love to know if anything such as sleeveless waistcoats are usually hot on top of a blouse or not as well! Any advice on pieces I should avoid for hot weather for now would be amazing as well!

Thank you :D