You can add your own stylesheet to the settings tab using ct_sizeguide_styles filter.

Example:

add_filter(‘ct_sizeguide_styles’ , ‘add_sizeguide_style’);

function add_sizeguide_style($current){
$StylesheetURL = ‘http://www.example.com/assets/sg_style.css’; //link to the stylesheet
$label = ‘My custom style’; //name of the style to be displayed in the settings
$current[$StylesheetURL] = $label;
return $current;
}

This code should go to your functions.php file (or anywhere else you wish).

If you are developing a theme and want your style to be selected upon the plugin activation, simply change the body of the function to:

$current = array($StylesheetURL => $label) + $current;
return $current;