When I first read this comic strip, I thought the artist had made a typo in Sena's line in the first panel: it seemed like she meant to say "check (チェック) her body line" rather than "zip (チャック) her body line up". But then the last panel shows her actually zipping up a jacket to cover her body, so the "typo" might be intentional after all.
Which is why I decided to preserve the typo in the translation, using "take a lock" in place of "take a look". Admittedly though, it's a bit of a shot in the dark.