Touch The Hem Of Someone's Garment Meaning

Example : 1847, Henry Wadsworth Longfellow, Evangeline, Part the First, I:  Thus, at peace with God and the world, the farmer of Grand-Pré  Lived on his sunny farm, and Evangeline governed his household.  Many a youth, as he knelt in the church and opened his missal,  Fixed his eyes upon her, as the saint of his deepest devotion;  Happy was he who might touch her hand or the hem of her garment!1903, Irving Bacheller, Darrel of the Blessed Isles, ch 29:  "I do love you," he said with a strong effort to control himself, "but I am not worthy to touch the hem of your garment."1994 March 9, Todd S. Purdum, "Clinton's Coming to New York, But Mayor May Skip Invitation," New York Times (retrieved 17 Sept 2013):  President Clinton is due at Brooklyn College. . . . "If he just wants to cut a ribbon or let us touch the hem of his garment, we don't need that."2001 June 24, Richard Lacayo, "A Hero's Welcome," Time (retrieved 17 Sept 2013):  Nelson Mandela . . . can bathe in the adulation of a worldwide throng yearning to, if not touch the hem of his garment, at least catch a glimpse of him whirring by in a motorcade.