Convertible pillow and transforming method thereof

A convertible pillow, comprising:

• a bedding pillow body, having a first portion and a second portion, comprising:
• a pillow filler;
• and
• a pillowcase containing said pillow filler therein to form a bedding pillow and having a skin contacting surface on one side and a covering surface on another side;
• a transforming envelope, being integrally provided on said covering surface of said pillowcase and having an envelope opening and an envelope cavity, shaped and sized to envelope at least a portion of said first portion and said second portion of said bedding pillow body in said envelope cavity via said envelope opening after said first portion and said second portion of said bedding pillow body are folded up on said skin contacting surface of said pillowcase to form a cushion body;
• and
• a retaining arrangement, provided on said pillowcase and configured to retain said bedding pillow body in form of said cushion body by holding at least a portion of said first portion of said bedding pillow body in a folded condition and retaining said folded first portion being enveloped in said transforming envelope, including:
• a resilient unit provided along a top side of said envelope panel of said transforming envelope so as to provide an elastic pressure along said top side against said bedding pillow body, and
• at least a pair of first and second fastening elements respectively affixed to two end sides of said pillowcase such that when said bedding pillow body is folded up, said first fastening element and said second fastening element are able to be fastened with each other to retain said folded condition of said first portion and said second portion of said bedding pillow body, such that said bedding pillow body is retained in form of said cushion body by holding said first portion and said second portion in said folded condition and retaining said folded first portion of said bedding pillow body being enveloped in said transforming envelope.