Sorry, my previous comment has a lot of typos. I'm really tired right now.

Remember this: CLOTHES HAVE MORE THAN TWO TAGS. Clothes actually have a total of SIX TAGS, and the other four tags DO AFFECT THE SCORE. Take the scarf "Natural Gift", for example. It's main tags is Simple and Pure. But if you look it up in Wardrobe and tap on it. You will show you the tags and it's description, but next to the "Introduction" tab you'll notice a tab called "Attributes". This shows you ALL the tags an item has, and the scores for each item. "Natural Gift" has Simple (S) and Pure (S), as expected, for now you can see it also has Lively (S), Warm (S), and Cute (A). It's in the upper left hand corner, across from the "Decompose" option. Chaning an item's color can also change it's scores and attributes, so take a look at what would change.
TL;DR: Look up the item in wardrobe, tap on the item, and check the attributes as well as the main two tags. The two main tags are the strongest attributes. The score an attribute can have is S, A, B, and C, none seem to have F. You can also see all the attributes in the Customization menu when you're changing an item, and changing an item's color changes it's attributes and its scores. Clothing has six tags, not two.