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There are many items that can affect hair, but there are 3 main ones:

- Sainte Ciel: Agape (scissors pose)
- M's Sketchbook (hairpins pose) or its recolours
- Princess Less Than Three (hairclips pose) or its recolours

All of these cutters are invisible on your avatar. The question is: how do you know which one to use?

Sometimes it can be a guessing game figuring out which cutter will give the desired effect to the hair you're using. However, it is often predictable and this is how I would categorize them:

Agape (scissors): sometimes removes back of hair (makes hair short), sometimes removes a certain part of hair (e.g. ponytails), sometimes can remove hair accessories (e.g. headbands), in some rare cases it changes hair's appearance entirely

Sketchbook (hairpins): usually removes back of hair (makes hair short)

Princess Less Than Three (hairclips): usually removes hair accessories, but may also remove parts of hair

The best way to find out what they do is to play around with them.

There are also a lot of items that can shape hair/bangs a certain way. This guide will show you their effects: Hair Cutters and Mods

There are so many clothing cutters on Gaia, and some of them don't actually have a specific way of knowing what they'll do to clothing. This is even more of a guessing game than with the hair cutters.

This guide lists which cutters affect which items. Unfortunately, it's not a visual guide, but it does say what will be affected/removed from the avatar when equipping certain cutters.

Clothing Cutter Guide (moreso for removing shoes, socks, sleeves from arm/leg mods)

This guide is a visual one, and focuses more on the mods that do make more predictable changes to your avatar. This one has a lot to do with cropping shirts, cutting dresses/skirts, altering necklines, and cinching the waist.

Scissors + Misc. Mods With Same Effects