School officials said the employee's headaches are set off by looking at multicolored clothing, The Local reported Thursday.
"It's a pity for the employee and as a result I've tried to create an appropriate work environment. The person in question has a right to be able to work," Principal Maj Norberg told the Norrlandska Socialdemokraten newspaper.
Some parents have objected to their children being forced to change to more blandly colored clothes when they show up in "inappropriate" garb.
"I have a hard time believing that they have a right to make this sort of demand," said Ulf Eriksson, head of the National Association of Homes and Schools.
"As a politician I think it sounds a pretty strange to force preschool children to have a certain type of clothing. We don't have such regulations in this municipality," Weine Backman, head of the committee for children, education and culture for Gallivare municipality, told the newspaper.