There are plenty of opinions on hot weather carry. When beginning to carry there are a few guidelines that must be kept in mind:
1. It is sometimes easier to change to your wardrobe to suit carrying your weapon than it is to find a carry style that suits your wardrobe.
There are a myriad of ways to carry a gun and many of them are suitable for just about every type and style of dress, there are a select few methods that work well with standard modes of dress. This does not mean you must change your entire style but it may mean selecting shorts with belt loops rather than running style shorts or changing your style to include shirts which work well untucked, polo shirts, cuban or hawaiian shirts come to mind. Adding a garment such as the famous "gun vest" or a light jacket helps as well.
2. Carrying a gun is not meant to be comfortable but comforting.
Guns are for the most part, heavy, bulky and inconvenient. These factors can be mitigated through selection of both gun, equipment and clothing but never eliminated.
3. A few good quality holsters and a good quality belt will be more comfortable and conceal better than a bunch of cheap gear.
There are many "gimmick" carry methods that are offered online and at gunshows but most are designed for particular cases or situations and may not work well as an every day carry method. These should be avoided until you have some carry experience and quite a few should be avoided entirely. Trying out different carry methods with inexpensive holsters (and a good belt) then finding a high quality holster in the style that works best for you will save you a good deal of money in the long run.