A fiber treatment agent can provide artificial hair fiber with softness. The fiber treatment agent includes a cationic polymer having a structural unit derived from diallyldimethylammonium chloride (DADMAC), and content of the cationic polymer is 0.02 to 0.5 weight %. The cationic polymer preferably has a structural unit derived from acrylamide. Preferably, the fiber treatment agent further includes an antistatic agent, and content of the antistatic agent is 0.2 to 5.0 weight %.

A fiber treatment agent can provide artificial hair fiber with softness. The fiber treatment agent includes a cationic polymer having a structural unit derived from diallyldimethylammonium chloride (DADMAC), and content of the cationic polymer is 0.02 to 0.5 weight %. The cationic polymer preferably has a structural unit derived from acrylamide. Preferably, the fiber treatment agent further includes an antistatic agent, and content of the antistatic agent is 0.2 to 5.0 weight %.

A deodorizing and anti-irritating brassiere is presented. The brassiere includes one or more fabric portions and the fabric portions are made of nylon, polyester, cotton, and polyurethane (e.g., Spandex); these include fabric blends of nylon, polyester, cotton, and polyurethane/Spandex. The brassiere has a deodorizing and anti-irritating coating that includes a deodorizing, bactericidal and fungicidal component of

##STR00001##

wherein m is 2, 3, 4, 5, 6, 7, 8, 9 and a deodorizing component that includes the following compound:

##STR00002##

and a compound according to the following formula (I)

##STR00003##

wherein n is 6, 7, 8; R.sub.1, R.sub.2, and R.sub.3 are jointly or independently selected from H or

CH.sub.2CH.sub.2SO.sub.3.sup.Na.sup.+(II)

wherein the total number of groups represented by formula (II) can be 2, 4.

A deodorizing and anti-irritating brassiere is presented. The brassiere includes one or more fabric portions and the fabric portions are made of nylon, polyester, cotton, and polyurethane (e.g., Spandex); these include fabric blends of nylon, polyester, cotton, and polyurethane/Spandex. The brassiere has a deodorizing and anti-irritating coating that includes a deodorizing, bactericidal and fungicidal component of

##STR00001##

wherein m is 2, 3, 4, 5, 6, 7, 8, 9 and a deodorizing component that includes the following compound:

##STR00002##

and a compound according to the following formula (I)

##STR00003##

wherein n is 6, 7, 8; R.sub.1, R.sub.2, and R.sub.3 are jointly or independently selected from H or

CH.sub.2CH.sub.2SO.sub.3.sup.Na.sup.+(II)

wherein the total number of groups represented by formula (II) can be 2, 4.