We spent a few years just telling DS what to do a lot of the time. I don't think it's a GT thing as much as an anxiety thing, though. He just found the responsibility for making decisions completely overwhelming. I fielded a lot of criticism from other parents for my being so "bossy" but in the end he really did calm way down about it and doesn't have a problem with decisions at all now (at 9). Everyone said he'd never learn to make choices, and he'd feel like he had to agree with me all the time, but it hasn't panned out like that... (LOL)
One of the steps that eased us between my directing everything and his taking charge of some things was to have him make decisions well ahead of time. For instance on the clothes thing, I would have him make outfits out of all his clean laundry and stack them in cubbies in his closet. It involved choosing shirts and pants and whatnot, but like 5-7 at a time. Then each morning he could grab an outfit and get dressed without trying to make the decision when he's sleepy and/or in a hurry. Food decisions were eased by my asking his opinion about them when I was going to the grocery store, rather than at meal time. So for instance he'd help decide what kinds of breakfast foods we'd buy, but then each morning I'd just make one meal from what we had -- not giving him the run of all the choices we had available but knowing that he had helped pick them all, so none of them was completely revolting or anything.
I can't remember when things changed... it was pretty seamless actually.
