Thank you so much Gaia, for taking the time to comment! You dedicate so much time and effort to all of your replies. I greatly apprecitate it and I'm sure newcomers, like myself, do as well! So, before removing edge loops and vertices, I trigulated the faces and checked to see if any of the faces had 4+ sides. Turns out that one of the faces had 5 sides, which was preventing me from uploading the shirt and instead giving me "Missing..." etc. In conclusion, I was able to upload the mesh without any issues after that, but I do agree that I should work on creating less dense mesh in the future.
Again, thank you so very much for offering actual help and for not being condescending!