I dont think there are definitive qualities of a good wife. We can debate a whole day long,different men/women have different tastes. There are alot of issues involved in marriage for instance the slim thing,you dont expect her to maintain the same slim trimmed figure after she pops you half a dozen kids! So beauty is not definitive some guys likes them big,some small etc
Ironically there are some jamaaz who want their wives to be skinny or stay in shape while they are cultivating pot bellies and love handles. Thats unfair to the lady,if you could hit the gym with mrs. that would be fair. In otherwords we all have different views of what beauty should be like and so do women. The bottom line is a wife is a person you ought to be happy with and you treat each other good. Physically beauty withers with time,FACT! So that figure 8 you might be seing now,15yrs or 20yrs after the nuptuals (marriage) it might not be there so what would you do? start rolling your eyes kwa mtoto wa jirani? hell no! We ought to be looking far beyond the physical looks when it comes to choosing our wives cause if you are the type is obsessed with physical attributes,then problems will emerge once those fade away. So instead things like,patience,understand,prudence,love and of coz communication.
Communication is very important in your later stages cause when the figure 8 and the hips are long gone and 'shuma' or 'fimbo ya nyayo' does not work anymore you will need your communication skills cause all you can do is talk. If you can watch your grand mum and dad you'll see what i mean. All they do is talk and listen to each other and enjoy their companionship. Depending on what your perception of a good wife/husband is,you have to take all these factors onboard.
The other thing is you will not find a person who is a complete package of what you are looking for cause you also are not complete if you can put yourself in your partners shoes. Basically see what they have that you like and whatever that is lacking you help them acquire those virtues that is if you really love them and they will do like-wise to you. Good luck in the hunting ladies and gentlemen. We can not list all qualities here but they may have some and lack in others,we cant draw a definitive list to this
Jay