Here's a strange thing. This is Oswald in his distinctive t-shirt, which looks tattered and has the stretched sunken collar that was v-ish in shape. It's just like the t-shirt he wore in the doorway.
But, here he is at the first lineup. Notice how different the t-shirt is. It looks newer and has a perfectly round collar.
So, what, did they make him change his t-shirt? Just for the lineup? Why? I could only speculate about that, but you can be sure it was because they thought it would serve him being picked.