The Prachuab Khiri Khan Walking Street is a large night market held a few days par week and on public holidays on a portion of the waterfront street that runs from Khao Chong Krachok mountain to the Saranwithee Bridge. The entire first half is devoted to take-away food and drink stands while the last stalls sell clothes, accessories and objects of all kinds but mostly clothes.
This Walking Street is absolutely not a market for Western tourists, they are very rare here but was created for locals and Thai tourists. It's a great place to discover and taste Thai Street Food, one of the tastiest in the world. Note that there also is every evening of the week, a small culinary night market on a small place near Yutichai Hotel.