taxfrbikini fu'ivla

x1 is a bikin/two piece skimpy woman's garment of material x2 consisting of top x3 and bottom x4

Can be used in the sense of swimwear, or coordinated underwear, or even skimpy outerwear. The key aspects are two piece, for women, and covering little more than the breasts and crotch.

In notes:

x1=t1 is panties/knickers/boy shorts (female genital underwear), serving purpose x2=t3
x1=t1 is boxer shorts/boxer briefs/briefs/jockstrap (male genital underwear), serving purpose x2=t3
x1=t1 is genital/crotch area underwear, serving purpose x2=t3