Costumes in the classic era of Thailand
The beautiful fusion of Indian and Khmer style of Thai costumes continued to be popular in the Ayutthaya period 1351–1767,  with intricate patterns and vibrant colours being incorporated into the designs. The clothing was often accessorized with elaborate jewellery, such as gold bracelets and necklaces adorned with precious gemstones. As the longest reigning kingdom in Thailand, unique ways of clothing styling emerged as a result of different cultural and social interaction established through diplomatic and trading relations with different countries. Both men and women conserved using loincloths called Pha Chung Hang or pants as part of their daily attire. However, the wearing rules differed from men and women, pha chung hang for men was usually worn to cover the waist to thighs, while women wore it to wrap around the waist to below the knees and ankles. Sabai is used as a breast covering for rich women to indicate social statues, while the commoners remained uncovered. Jewelleries, gold bracelets, and necklaces were often indicate royal family status. High rank noblemen wore a loose open white cotton shirt. However, it was a social rule for men to remove the shirt and appeared bare chest to indicate the lower rank gesture in the presence of the highest authority during this era. For centuries Thai women fashioned clothing in many different ways of body exposure. Up until late of 19th CE, following a modern adoption of Thai clothing, feet and breast covering was compulsory for women and punishable by law for those who commit a breach. In Ayutthaya period, the court men wore the lomphok (Thai: ลอมพอก), which is a white layered head cover made of bamboo for the nobles. The use lomphok headgear was inspired from the turbans of Safavid-dynasty in Persia.

During Rattanakosin era (1767–1932) of early Chakri dynasty , Siam entered a new historical period, where the Thai royal power was continuously solidifying against the tide of western ceaseless invasion. Rebranding fashion and the clothing style for royals were seen as a necessity, which complement tactical defence and foreign diplomacy of the authorities. In 1860s, the traditional approach of Thai royal costumes developed to embrace Victorian corporeal and western-sartorial to represent royal family personas. It is during this era, royal tailoring department was developed and the governmental and public officers were ought to wear a pre-defined court attire and ceremonial uniforms. The use of unisex items such as pha nung (Thai: ผ้านุ่ง), a traditional tubular long skirt, appealed to the favour of Westerners’ taste. This era is characterised by the revolutionary approach of fashion as a political statement in Thai clothing history. From traditional conservation outlook to modern Victorian sartorial fashion, the King Rama I and the queen embrace western clothing characters, developing a more distinct gender identity in the appearance of male and female. This new fashion came into the manifestation amidst national threats of western invasion from the neighbouring areas. Victorian inspired Thai royal costumes and the projection of European-inspired military jacket on the King Mongkut’s appearance intensified the image of Thai royal power and dignity. This renewed national fashion statement played crucial role as the entry façade of Thai nation in order to make a stronger and a modern impression to address the concerns of visiting westerners.