During the Spanish occupation of the Philippines (over 300 years from 1561-1889) the barong tagalog was required by the Spanish government for Filipinos (indios) to be worn at most times to show the difference between the rich and the poor. He said that the poor who serve the rich must always be in uniform.
Take their chauffeurs, maids, and employees as examples. They are in uniform to immediately distinguish them from the employers. When the Spaniards colonized the Filipinos, they had to make it abundantly clear who the boss was through the imposition of a dress code. Men were not allowed to tuck their shirttails in. That was the mark of his inferior status.
Second, the cloth material should be transparent so that he could not conceal any weapon that could be used against the masters. Third, as a precaution on thievery, pockets are not allowed on the shirt.
By the turn of the century a new middle class began to emerge among the Filipinos. These were known as the principalia. They have mastered Spanish laws and were able to obtain title to lands. They became successful in business and agriculture and sent their sons to be educated abroad. They were privileged to build their houses in the poblacion around the plaza near the seats of power.
Only a member of the principalia could be addressed by the title DON, and only they were allowed to vote. They had all the trappings of power and status, but for one undeniable fact: they still had to wear their shirttails out, if only to remind them that they were still Indios. What the Spanish authorities did not smother out was the Filipino’s will power and deterrmination to psychological conquer their colonial masters, through improvisation and reinterpretation. The Filipino’s stylistic bongga (flashy dresser) was a reaction against the overt discrimination and insensitive oppression of the Spaniards.

