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SIWALAI - FORMAL, TRADITIONAL AND MODEST COSTUME  It's named for Siwalai Grand Palace . This dress looks like little similar with Boromphiman , another Thai outfit .  This dress has long sleeve blouse with a short standing coller . And a Sabai drapped across the chest across the Chakraphat , and sinh with a front pleat that can be separate piece or sewn into the blouse . And this dress is similar to Boromphiman .  This costume Siwalai is also commonly seen at royal functions and very formal day time party Source - Google 

All the Thai costume are very gourges.    DUSIT - It's name also come from Dusit Mahaprasad Hall . This outfit Dusit is totally different from all other traditional outfit.  In this outfit the blouse is totally sleeveless and the coller is round neck and back-line. It opens at the back and adorned with sewn on jwellery like - pearl, beads and sequins . This costume is worn with gold brocode that is pleated in the fornt of the dress and paired with a belt. This dress Dusit is a formal Western style evening gown. Source - Google 

CHAKRAPHAT - Layers and layers of elegance, gourges costume. Named for Chakraphat Phiman Throne Hall, this dress Chakraphat is mostly similar to Chakri but considered most elegant. The key difference is that is that this costume uses two Sabai layered over each other. This costume is especially embroidery design. The Chakraphat is often highly accessories with a necklace, a belt , a tiara , armbands , bracelets and earrings depends on occasions .  This Chakraphat may be worn for formal banquet and official dinners Source - Google  

It's another Thai costume named Boromphiman  BOROMPHIMAN - Named after Boromphiman Throne Hall , in this dress Boromphiman also uses luxurious fabrics either Thai Silk or silk brocode. Key difference from the Amarin and the blouse does not have any bottoms . It can either open front or back. The blouse is sewn into the sinh as a single piece and the sorong in pleated infront in a fashion known as " JEEB WAI CHAI POK " . Accessories also include an ornamental belt . Considered formal , the Boromphiman is worn for evening functions and other occasions that call for full or half dress attire . It's a royal dress. Source - Google

It's time to number five ... Another Thai outfit for women.  AMARIN - Named after the Amarin Winitchai Throne Hall, the dress Amarin is mostly similar to Chitralada costume . But in this costume Amarin , uses more luxurious fabrics and is paired with an extravagant set of jwellery. The silk garment may also incorporate gold thread especially in flower embroidery.  This costume is especially for evening party, reception, functions, royal ceremony etc. It's also called ful or half dress attire. Source - Google 

Another interesting costume for all ..... Now it's time to number four ...... CHAKKRI - Named from the Chakkri Maha Prasad Hall , at the Grand Palace. In Thailand Chakkri is a very formal gold or silver meterial trend brocode evening dress. The style is a skirt with the front pleat and traditional Thai dress , shoulder cloth. It is often embellished with embroidery. It's a formal and elegant wear. It's produced using a wearing technique called "YOK" . It's a wedding costume. Source - Google