For factory-made clothing, visit the Indra Square area in Pratunam, where hundreds of shops sell discounted items. This rabbit warren of a place is kind of fun to hunt around in, and bargains can be found. The heat and humidity can be oppressive during the hot and rainy seasons, though. There are a few little restaurants tucked here and there for when you need a break.
Ratchaprarop Rd., behind Indra Regent Hotel, Bangkok, 10330, Thailand