It would be interesting if clothing could have healing bonusses as well as normal damage bonusses - much like some rings. However, it might be difficult to implement to everyone's satisfaction - some non-life players enjoy using healing spells as well, and finding a proper balance between healing-geared clothes and defence/offence-geared clothes (that we already have) would be troublesome at best.
Currently, however, you can use the various rings that gives bonusses to incoming and outgoing healing.