Police said they believed the attacker may have changed his clothes - and discarded them - before authorities arrived at the scene.
"Police are therefore asking New Brighton residents to check their properties for discarded adult's clothing.
"If you find anything, please do not touch or move it - but call police immediately.''
A 68-year-old man has been charged with causing grievous bodily harm.
He is known to the woman and will appear in the Christchurch District Court today.
Police are appealing for anyone who may have information relating to the stabbing to come forward.
• Can you help? Anyone with information is urged to call Christchurch Central Police on (03) 363 7400 or CrimeStoppers 0800 555 111.