I had avoided making my 5 y.o. twin boys dress themselves until recently (DD7 has been doing it herself since she was able - her decision LOL - talk about fashion statements). After all, it's so much faster if I do it myself, and actually takes a lot less energy than all the yelling I occasionally have to do (here I am, 7 months along with child #5. So any path to "easier" is one I usually take, especially when it involves getting out the door anywhere close to on time). The last things I started making them do themselves were socks and shoes, just within the last month or so.
But I recently realized that we were missing out on a daily opportunity for DS5 to work on motor skills, especially with the socks (he has fine motor and various other sensory processing issues). In fact, a lot of the things his new OT has recommended involve having him help out with certain household "chores" on a daily basis. For DS5, now I think it's really quite important that he do these things himself. In contrast to his fiercely independent sister, he likes to be the baby, so changing over was hard. (in addition to motor skills, I also want to build his confidence regarding self-sufficiency.) So anyway, I think the motor skills angle may be something to consider for a child who has that sort of issue - obviously that can make getting dressed that much more difficult and time consuming, but in some cases the work may be a valuable contribution in an OT kinda way. Make sense?
One other little trick I should throw out there is to be creative with incentives - for a while the kids wanted to watch a certain show on tv in the morning, and I would tell them they had to be dressed first. Likewise, lately they've been arguing over who mommy will sit next to at breakfast, and I'll then say that I'll sit next to whoever gets dressed first (you never saw them get dressed so fast in your life LOL. Trouble with that is the last one usually sheds a few tears). So, be on the lookout for things that they really want, especially in the morning, to use as a bargaining chip.
