On Hoods - Morphs do best for simple lateral motions - ie .. larger/smaller, in/out.  They arent so good going round corners. Most hoods you will find have a custom bodypart for the hood (or use head) that can be bent up or down, and a morph to flatten it on the back. Your mileage will vary

For hair fits, just make a bunch of larger/smaller morphs. Anything more eggregious, would have to be done on the hair, and there is a magnet kit for that. (made by me, in fact)

On Thickness  - Generally most clothing is modeled with turned edges, so give an edge and an illusion of thickness. Poser does not like doublesided polys, and fully lined clothing items are a complete nuisance when it comes to morphs and pokethrough

On Conversions - Not all clothing items convert well. gloves and shoes usually do badly. You get the best results going from no-breasts to breasts. Going the other way often leavs odd puckers.  I use CrossDresser for the most part. You might want to look into the new improved morph tool in sr3 for doing touchups.

Lyrra