Layers are a great for adding color variety, changing shape, improving bust and cleavage outlines. As the weather warms up, one additional layer can make it feel uncomfortable warm.
In Spring, for my guy wardrobe, I switch from wearing undershirts to just wearing t-shirts and polos. Underdressing today with a bra under a t-shirt, it definitely felt much warmer than just wearing a t-shirt. A thin cami can have the same uncomfortable effect. This might explain why the majority of women I know seem to run "hot" compared to me, they have to wear at least 1 more layer (a bra) or 2 more layers (a bra + a cami) than what I wear in guy mode.
A solution, wear thin tops (definitely not guy t-shirts), sheer tops, or lace tops when wearing a bra or cami. Seems like reverse logic - women choose to wear a bra or cami under a thin top, while us crossdresses look for a top to go over a bra or cami.
