If you are looking for shirts which are slimmer through the chest then the Thomas Pink Super Slim Fit and the new TM Lewin Super Fitted (only available in white) are both slimmer than the Charles Tyrwhitt Extra Slim Fit.
For those interest in slim shirts, TM Lewin have a launched a new shirt called the Super Fitted. It's only available in white at the moment, but from my calculations this and the Thomas Pink Super Slim Fit are amongst the slimmest on the market.
I have both a Brooks Brothers non-iron Extra Slim Fit and a Charles Tyrwhitt non-iron Extra Slim Fit. When the Brooks Brothers comes out of the washing machine I put it on a hanger and it dries wrinkle free. That doesn't work for the Charles Tyrwhitt shirt. Having said that. I prefer the cut of the Charles Tyrwhitt extra slim fit.
I'm not sure why you think that. I've just been on the TM Lewin site and there are lots of fully fitted shirts which are not non-iron. Two examples arehttp://www.tmlewin.com/Fully-Fitted-White-Poplin-Shirt/40439,en_US,pd.html?start=1&cgid=Mens-Fully-Fitted-Shirtsandhttp://www.tmlewin.com/Fully-Fitted-Blue-Poplin-Shirt/40440,en_US,pd.html?start=8&cgid=Mens-Fully-Fitted-Shirts
As far as I know, Charles Tyrwhitt haven't changed their shirt sizes. They have changed the way they present chest measurements and are now showing a "to fit size" on their website (they used to show garment sizes). I emailed them about this in February 2013 and they said they hadn't changed their sizes.
Flyswatter - you're right. Charles Tyrwhitt have not changed the sizes of their shirts, just the way they present the measurements (I had this confirmed by a Charles Tyrwhitt sales rep on email). Instead of giving the actual shirt measurements they now give a "to fit chest" measurement.You can find the old chest measurements at the link below towards the bottom of the page. The table shows that for the chest measurements the Classic Fit is larger than the Slim Fit which...