I personally have a weakness for the tunic and the shirtdress. However both these items, as insanely comfortable as they are, can be difficult to pull off in a work environment. However with the appropriate accessories and layers, they can be just as office-appropriate as the basic tucked-in blouse and pantsuit.
This shirtdress from Claridge & King comes with a drawstring to bring in the waist, which is perfect. Otherwise, I’d add a belt to show a waistline. Now how to make this work-appropriate? You can wear the shirtdress as a dress if the length and cut are appropriate (aka if the hemline is straight across – if it is scooped then don’t wear it as a dress to the office). If that is the case, you can wear it buttoned with a belt for emphasis – or wear it open over another dress!
If your office is more conservative, then wear a long blazer over the shirtdress. If you have a long blazer with 3/4-length sleeves that would be ideal, because then you can roll the tunic sleeve cuffs over the sleeves of the blazer.
Also if the hemline of the shirtdress is shorter than two inches above the knee, then don’t wear it as a dress but rather wear skinny black slacks and pumps or flats. The whole point is to create length and by adding the blazer, you’re working with the length instead of fighting it. Plus the skinny pants won’t fight the extra fabric you have on top. Add a long thin gold or silver chain necklace for a feminine ‘pop’ to this masculine (yet oh-so-chic) working look.