It looks like you are using a text field for the hair_color field rather than a select/option field.
So try any of these:
<?php
$queried_object = get_queried_object();
$taxonomy = $queried_object->taxonomy;
$term_id = $queried_object->term_id;
$hair_color = get_field('hair_color', $taxonomy . '_' . $term_id);
echo $hair_color;
?>
<?php
global $post;
$taxonomy = "someting";
$terms = get_the_terms($post->ID, $taxonomy);
if( !empty($terms) )
{
$term = array_pop($terms);
$custom_field = get_field('hair_color', $taxonomy . '_' . $term->term_id );
// do something with $custom_field
}
?>
See this example for more info: http://www.advancedcustomfields.com/resources/how-to/how-to-get-values-from-a-taxonomy-term/
If you do want to use a Radio Button field type and have them choose from a list of hair colors, then this might work too (I think):
<?php
$field = get_field_object('hair_color', $taxonomy . '_' . $term->term_id);
$value = get_field('hair_color');
$label = $field['choices'][ $value ];
echo '<p>' . $label . '</p>' ;
Probably didn’t work before due to being text field rather than select/radio field and the $taxonomy value not being defined, although not sure…
