What Thai public-decency law actually targets
The claim about underwear is best understood as a shorthand for a broader rule, not as a clearly stated dress requirement. Thailand’s Penal Code addresses indecent conduct in public, including openly exposing the body. It does not set out a specific rule saying that every person must wear underwear.
That distinction matters: a law against public exposure concerns what someone displays in a public setting, rather than what they wear beneath ordinary clothes. Whether a particular situation counts as indecent can depend on the conduct and circumstances; the law does not spell out a simple underwear-based test.
Why the distinction matters to travelers
Going without underwear beneath clothing is not the same thing as appearing publicly unclothed. The practical legal risk comes into view if clothing leaves intimate parts exposed or a person otherwise behaves indecently in public—not merely because an unseen layer is missing.
For visitors, the useful takeaway is less about packing a particular garment than about respecting public-decency norms and avoiding public exposure. A short viral claim can make the rule sound unusually specific; the underlying concern is public conduct.
