For the first month after King Bhumibol Adulyadej death, people have been asked to wear only black and white.
As country is in the mourning, some retailers have run out of black clothing entirely.
The authorities have warned traders they will be fined or jailed for inflated prices in the wake of some reports claiming some retailers took advantage of the the revered monarch's death.
The Thai government has declared a year of mourning for the royal, who died on Thursday at the age of 88.
People have been asked to wear only black and white clothes for the first month after the King's death.
Clothes dyeing stations have popped up across the Thai capital Bangkok to satisfy the growing demand.
Associated Press reported, that volunteers rushed to write down names and contact information from a stream of visitors bringing in clothes to dye black.
“Some people don't have black clothes or don't have enough to wear,” Kanokporn Tantranont, a Krung Thai Tractor employee helping out at the centre, told the news agency.
“If you go out to buy more clothes, the prices are so high,” he said.