I'd agree that 3w2 tends to groom themselves the best in a conventionally attractive way. They are typically up-to-date when it comes to trends. The SX first version is usually the most conventionally "sexy". Female SX 3w2 individuals usually dye their hair blonde and adopt a stereotypically feminine look.
2w3 would probably be the second-best in this regard. Being a fellow image type, and with the 3 wing concerned with being "successful" at looking good, they can also look quite conventionally attractive. The women are often stereotypically feminine-looking too, though not always (less so with the Intuitives).
Type 4s can also groom themselves better than the average person, though their style may repel most people, depending on how "off-beat", "unique", "weird" etc it is. That's why 4w3 people usually fare better there. If they focus on their 3 wing, they can be almost just as conventionally attractive as a 3(w4), but most 4s rarely go there. One example of a 4w3 who did was Michael Jackson. 4w5 people (in their youth) are often the Goths or Emos who can be hot, but not really to most people. Type 4s often like to adopt a "niche look" of some kind, and that won't be appealing to most people.
After 3w2 and 2w3, I'd place SX first 6w7 and 7s. After that, 3w4. After that, (male) SX 8.
As @
darya said, 9s can be a hit or miss. They are either total slobs or acceptable dressed, typically in a laissez-faire style. The 9s who move to 3 are typically more immaculately dressed and can "look" like 3s. Similar thing applies to 1s. Many 1s are rather plain in style, but on average they tend to dress more professionally and appealing than an average 9. Especially Social 1s care more about coming across as well-dressed and professional.
The worst dressed and worst styled would be a typical 5w6, followed by 5w4. Many 5s don't pay much attention to their appearance at all, and when they do it can be quite awkward, unless they get some help... They are the most in need of some fashion advice, stereotypically. Some 6w5 and also 4w5 people can be quite sloppily dressed at times, too. 5s are too much in their heads to focus on appearance, on average.