x1=t1 is panties/knickers/boy shorts (female genital underwear), serving purpose x2=t3
Female genitalia/crotch/vulva-covering type of underwear. Needn't be worn by female/woman/girl but garment need be made for female genitalia/pubic region in some manner (see nakpibyta'u/pibyta'u for male/non-defined counterpart). Cf. nerta'u, taxfrbikini, tatyta'u.