This invention relates to a garment lengthening piece that can be used as a handbag or a vest. It includes a sheet-shaped body. The sheet-shaped body includes a first side, a second side, a third side, and a fourth side that are connected end to end in sequence; The second side and the fourth side are connected together to make a cylindrical as first connector; Arranged at or near the first side, a second connector can be formed on the first side as shown to close the cylindrical bottom. A band-shaped part connected to the third side or near the third side. A third connecting piece that is arranged on the first side or the third side which can be connected to the lower part of the garment. The clothing extension piece that can be used as a handbag or a vest provided by this invention can extend the length of the clothing without needing to carry more clothes to meet people's needs. When it is not needed, it can also be carried as a handbag. When the upper part of the body needs to be kept warm, it can be worn as a vest, which realizes multi-purpose and can greatly meet the convenience requirements of people.
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