。
You look dashing.
Literal
Dashing is [confirmation-ね].
A rare, dated Edo-period compliment. 鯔背 (いなせ) is an obscure na-adjective meaning 'dashing, gallant, stylish in a masculine way' — originally describing the young fishmongers at the Nihonbashi fish market who wore their hair in a style resembling the back of a mullet (鯔, ina, a fish). Preserved now mostly in period dramas and nostalgic writing, it evokes Edo-period (pre-1868) urban masculinity.