Peplum blouse (wearable muslin)

So, for a very long time I've been wanting to make a late 1940s style peplum blouse. I just love the look and I do have a few store-bought ones but they really don't fit so well on my tall and big-boobed figure. The waistline ends up too high and/or the bust pulls up the fabric in the front... Guess how often I use them...? Pretty much never. 

I drafted a pattern based on my standard bodice and this picture i found on Pinterest (here: http://pin.it/4A7USbS ). 

A quick Google search and I found the front of the pattern envelope. Really cute, right?

I used those pattern pics as a guide and made a simple boat neck and nothing extra on this first attempt, mainly because I wanted to test the basic structure but also since I chose a busy fabric. Also I decided to put an upside-down zipper in the back. You can see the layout from the inside:

I learned a few things from this muslin! For one I hate zippers (ok I admit I knew that already. I need practice.). The old synthetic fabric scrap I used for the project (some rayon-ish thing) is very stiff and loves to make strange folds and puckers everywhere. Very obvious in the picture below.. (and that's the best pic from the back out of the six I took!) Also I really should have put on some more structured underwear (like, a corset or shaper of some sort) before taking these pictures... but anyway, could have been worse.

I need to adjust my pattern in the upper back (I am not quite as hunchbacked as I seem to think) and below the waist in the front (to make it even more hourglass shaped). But overall, not bad for a first muslin!