It is a mock tee shirt because it's made out of woven fabric. I do not find it to be in the least constrictive or uncomfortable, and the "method" I used was exactly the same as I would have used for this style if it had been a knit fabric. However, I would definitely not recommend going and sewing up a bunch of stuff with a woven fabric using patterns designed for knits! It's the loose-fitting style that makes this work. I'm sure you know that but for like liability or something...
Yes, I took pics of the process. We'll see about a tutorial... I think this would be especially good for a tutorial though because it would work well for any slightly flared skirt of a certain size, i.e., would make a shirt loose-fitting enough to look okay. I'm thinking a skirt whose measurement across the hem is 1/2 your bust plus 10 inches or something like that, and around 35" to 40" long. My dress had a skirt that was 40" long and I had some extra to match stripes on the sleeves, so you want too keep stuff like that in mind.
The original dress:
Courtesy of my sissy, who didn't like it for whatever reason. It didn't fit me, but I'm not much of a dress person anyway.
So, yes, thanks for looking!