Hi Zach. this is a well observed drawing, so awesome work with your clothing study! So I can see where you could have run into an issue with the tucked in shirt, and I think the main issue is that you got lost in the detail of the folds of the shirt. When we draw, we want to simplify and design our drawing based on the reference. I did a quick sketch to show what I would have adjusted, and I highlighted in yellow what major shapes I saw when sketching in the fabric for the shirt. If you wanted to tackle this again (or do another drawing based on another photo) try to interpret what's going on in the reference, and then simplify it in your own drawing. The key is to look for big shapes that still communicate what you want to show in your drawing, which in this case would be the behavior of fabric folds. I know this is a bit late, but I hope this finds you well! Let me know if there is anything I can make more clear, or if you have another clothing study you want critiqued!