How do you size/position the accessory correctly on such type of avatar?

Hello
What should be done so the helmet accessory is scaled/positioned correctly on such avatar?

image

Thanks in advance

The Accessory should be scaled at the same ratios as the Character automatically. For the Position, change the AttachmentPoint > Position > Y value to move it lower down. Experiment with small increments of 0.1 or so:
image