Get a concealed carry license. For the most part, looking good with a jacket tucked under a firearm, especially a blazer, is difficult to accomplish. The only way I have even seen open carry done with a blazer, without tucking the blazer back mind you, is to move the entire holster to the 12 or 1 o'clock position on the belt. Basically the firearm covers your crotch. Its not comfortable, its not fashionable. But its legal and doesnt wrinkle the blazer.