In most dreams they are shown as being on or off. When on they suggest a barrier between easy release of tension in going to the toilet, or experiencing sexual release. When off they suggest the opposite. They can also depict feelings of being more attractive, or attempts to cover up what is not attractive.
The word itself, or if the tights/pantyhose actually are tight, depicts how you restrain yourself, either sexually or in the your confidence.
As a cover for the legs and pelvis the colour plays a big part in meaning. The legs are our strength to stand up and act in life, so if they are dark or torn, it can suggest a problem with the confidence that can enable one to stand up straight and with confidence. If the darkness refers to the pelvis then it can connect with difficulties or blockages in expressing sexual feelings and love. See colours for the other possibilities.
Useful Questions and Hints:
What is the action of the dream telling me about the tights, and can I connect with that?
Are the tights show as some form of protection or restriction, and if so can I see how I am protecting or restricting myself?
Is there a suggestion here of sex, and what part are the tights playing in that?