Add close comment like /* .tag_name */ to end of the css or less style block.
Example:
.my_css_class {
} /* .my_css_class */
Note with either method, you may need to restart Sublime Text 2 for the plugin to load.
TODO: Add to Package Control
Clone git repo to Sublime packages dir.
git clone https://github.com/d4rkr00t/AutoCloseComment.git AutoCloseComment
When you in style brackets { } press (fast): CMD+Ctrl+c, CMD+Ctrl+v - on Mac Ctrl+Alt+c, Ctrl+Alt+v - on Windows