LACAUSA Firefly Slip Dress in Pink. - size XS (also in ) LACAUSA Firefly Slip Dress in Pink. - size XS (also in ) 100% viscose. Adjustable cami slip lining. Asymmetric hem. LACR-WD81. LA30155 LA30156. LACAUSA is born of the unique space where city, country, desert and ocean converge, Los Angeles.