I usually carry the same way I do through other seasons, but then again I am an appendix carry type that wears an undershirt year around. I usually will tuck the undershirt in, use the smallest IWB holster I can get that I place on the right side of my stomach, and have the over-shirt cover an m&p compact 9. I've carried everything from a small .380 to a full size beretta 92 this way, using anything from heavy jeans to athletic shorts, and it's done well for me so far as it doesn't print and it makes bending down and running much more comfortable for me.
There are downsides to this method though. If you only wear one shirt I wouldn't recommend it as a hot slide after a stint in the car touching your skin is not fun. It also leaves the barrel pointing in a direction that many men are uncomfortable with, but I've had no real problem with it so far. Can be somewhat annoying while using the restroom as well, but usually when I carry and I have to hit a public restroom, I enter a stall just in case.