Mike, and Taz,
I think the topics actually dovetail.
Taz, your wife may not want to wear anything to "diapery", at least not right off the bat, and probably not during the day. The idea of wearing full on diapers can be traumatizing, and people new to incontinent protection are always sure that everyone can tell, even though nobody is paying attention. A thinner, pull-on product is generally a good transition.
However, at night she could use a proper product (which you really need at night) without fear of judgement. For me, the plastic backed abena level 4 products are the ideal option. Abena L4 is widely available, and based on what Mike said, perhaps the older x-plus product is available through xp-medical. Either way, the plastic backed products stretch less, and control odor better in my opinion. They do crinkle more, and they're obvious if exposed.