Separable fastener with sliding sleeve

A separable fastener comprising:

• a male member having a stem portion and a T-shaped head portion with two arms projecting sidewards from the stem portion,
• and a female member constituted by an elongated body with a tail portion and a forward portion that is bent with respect to the tail portion, the elongated body having an opening therethrough adjacent the bent forward portion, the opening being of sufficient length to permit insertion of one arm of the T-shaped head portion of the male member, said bent forward portion of the female member terminating at an edge which interferes with complete passage of the T-shaped head portion of the male member in any but one particular orientation of the male member with respect to the female member, said edge having an indentation adapted to receive the T-shaped head portion when in said one particular orientation in order to avoid interference and permit complete passage of the T-shaped head portion through the opening, the opening further having a part wide enough to permit swivelling of the stem portion after passage of the T-shaped head portion through the opening,
• the female member having a sleeve member mounted on the tail portion thereof for sliding movement along said tail portion, the sleeve member at all times embracing only said tail portion, the sleeve member being adapted to inhibit the male member from assuming said one particular orientation by partly obscuring said opening and lodging between the female member and one of the arms of the male member.