I'm going to post a tutorial on this but before I go any further I have to say that this is completely elementary! So don't judge me if you are an expert seamstress and this is way beneath you!
Here we go!
I got my inspiration for this shirt here but decided to do something more simple. I made three rosettes using a really simple method that my sister Taylor taught me a few months ago. They turn out really cute and you don't even need a sewing machine!
First, you'll need a piece of fabric about the length of your arm. I used ribbon and a lacy headband (I cut the headband in half) but you can use whatever you'd like! This is super flexible :) The length and width of the fabric you use is dependent on how large or small you want your rosette to be, so have fun with it!
Once you've found and measured your fabric you'll want to fold it in half like this:
You'll want to use thread that is about the same color as the fabric you are using. It should be just about as long as the fabric you have chosen when the thread is folded in half.
So thread your needle...