A fastener for two items, such as two garments, comprising: - a first part attachable to a first item, comprising: ∘ an attachment part for attaching the first part to the first item; and ∘ an engagement element connected to the attachment part comprising a substantially flat element; - a second part attachable to a second item: ∘ an attachment part for attaching the second part to the second item ∘ a reception element connected to the attachment part for receiving and locking the engagement element of the first part, the reception element comprising an opening for receiving the engagement element wherein an opening contour of the opening is smaller than an engagement contour of the flat element of the engagement element in a first dimension, such that a distal side of the flat element can be arranged under a corresponding distal side of the opening of the reception element in a first position and a proximal side of the flat element can subsequently be arranged under a corresponding proximal side of the opening of the reception element in a second and locked position characterized in that the flat element of the engagement element comprises a flat pointed distal engagement section, the opening of the reception element comprises a flat pointed distal reception section corresponding to the flat pointed distal engagement section, the distal side of the flat element is configured such that it can be slid into the opening of the reception element and under the corresponding distal side of the opening of the reception element in a forward direction along the first dimension, and in that the flat element is made of a flexible and/or resilient material, wherein a section of the flat element adjacent to the proximal side of the flat element is bendable in an upward direction. - a first part attachable to a first item, comprising: ∘ an attachment part for attaching the first part to the first item; and ∘ an engagement element connected to the attachment part comprising a substantially flat element; ∘ an attachment part for attaching the first part to the first item; and ∘ an engagement element connected to the attachment part comprising a substantially flat element; - a second part attachable to a second item: ∘ an attachment part for attaching the second part to the second item ∘ a reception element connected to the attachment part for receiving and locking the engagement element of the first part, the reception element comprising an opening for receiving the engagement element wherein an opening contour of the opening is smaller than an engagement contour of the flat element of the engagement element in a first dimension, such that a distal side of the flat element can be arranged under a corresponding distal side of the opening of the reception element in a first position and a proximal side of the flat element can subsequently be arranged under a corresponding proximal side of the opening of the reception element in a second and locked position characterized in that the flat element of the engagement element comprises a flat pointed distal engagement section, the opening of the reception element comprises a flat pointed distal reception section corresponding to the flat pointed distal engagement section, the distal side of the flat element is configured such that it can be slid into the opening of the reception element and under the corresponding distal side of the opening of the reception element in a forward direction along the first dimension, and in that the flat element is made of a flexible and/or resilient material, wherein a section of the flat element adjacent to the proximal side of the flat element is bendable in an upward direction. ∘ an attachment part for attaching the second part to the second item ∘ a reception element connected to the attachment part for receiving and locking the engagement element of the first part, the reception element comprising an opening for receiving the engagement element wherein an opening contour of the opening is smaller than an engagement contour of the flat element of the engagement element in a first dimension, such that a distal side of the flat element can be arranged under a corresponding distal side of the opening of the reception element in a first position and a proximal side of the flat element can subsequently be arranged under a corresponding proximal side of the opening of the reception element in a second and locked position characterized in that the flat element of the engagement element comprises a flat pointed distal engagement section, the opening of the reception element comprises a flat pointed distal reception section corresponding to the flat pointed distal engagement section, the distal side of the flat element is configured such that it can be slid into the opening of the reception element and under the corresponding distal side of the opening of the reception element in a forward direction along the first dimension, and in that the flat element is made of a flexible and/or resilient material, wherein a section of the flat element adjacent to the proximal side of the flat element is bendable in an upward direction.