washed appearance the garment can be simultaneously decolorized typically blue jeans which would normally undergo desizing in a washer extractor can now undergo simultaneous desizing and decolorization by treatment with ozone without steam or in an aqueous medium in accordance with the invention jeans or fabrics which are dyed and sized are placed into a washer extractor equipped with a source of ozone the fabrics or jeans are not wetted typically the washer extractor is a 500 gal rotary drum type which normally rotates about 27 32 revolutions per minute however the slower rotation has been found to reduce creasing which results in streaking since the ozone does not make complete contact a rotation of the drum at about 2 to 10 rotations per minute in an ozone atmosphere for a period of time before any substantial degradation of the cellulosic material takes place has been found suitable for most treatments the exposure to the ozone for dyed and sized blue jeans is about 2 to 10 minutes preferably for about 2 to 5 minutes typical commercial runs in a 500 gal washer extractor involves about 180 jeans the dye ozone process is to be understood as ozone gas that is used with fabric that contains less than 30 moisture and that the fabric feels sensibly dry to the touch even though it will contain about 5 10 moisture preferably about 8 10.