Ooooh, shall I do a little baby clothes round up? Not gonna wait for an answer!
Gap, mostly always come up small, sometimes very small, their darker coloured t-shirts fade around the necks and cuffs quite quickly, so I avoid them, other than that they are good, really good for older kids jeans as well, DS1 has never gone through the knees on a pair of Gap jeans! Oh, and also they are really good for baby socks, they have a roll down part on which means they are more difficult for a wriggling 3 month old to get off! Also good for vests.
Next, I am always torn with them, they do some lovely quality items, and some really horrible items, t'is pot luck in there, though their sizes always seem to be bang on. They used to be a lot more tumble drier friendly as well, most of it has plastic type transfers stuck all over them now so they can't be tumbled. Their vests and sleepsuits are very good.
Debenhams, depends on the designer, Junior J stuff always comes up small, John Rosher's can come up quite big (again, especially the length of the trousers) Red Herring stuff is spot on, all washes really well, but mostly can't be tumbled. Oh, St. George by Duffer is really nice as well, if you can get over the colours!
Adams, used to be good, but are crap now.
I can't think where else I'd buy from.
Oh, Woolies are good for charactor clothing when they are a bit older, but have found their 'normal' clothes aren't much good, though haven't actually bought any of their normal clothes since DS1 was tiny.