There are a range of issues.
For example, marine armor currently occupies the space between middle and outer, but Recon and Cataphract also need to occupy that space. Formal vests and corsets don't occupy the neck, marine helmets occupy cover the eyes and upperhead, "full head" as the category but only listing Nose and Jaw when its meant to imply that it also does head ears and eyes in confusing, tribal wear no longer occupies the middle, many other apparel items are missing etc etc.
Many of these are small issues that can be fixed, but the rewrite tag is there because the format is inherently limited. A better format is needed that is clearer and can deal with the multitude of items that have been added since.