An astral suit in this form does not count as any type of armor, but does count as a psychoactive skin and follows all the rules of a psychoactive skin.
There are many different Psychoactive Skins, and they have different abilities, and cost is based on the abilities. Skins range from Skin of the Claw which costs 16,000 gp, to Skin of the Psion which costs 151,000 gp.
The Aegis gains the Astral Suit at Level 1. Does this mean a Level 1 Aegis can manifest his suit as an Astral Skin with the same abilities as an item that costs 151,000 gp, or does it only mean to act in the following way, with no extra abilities?
A deployed skin completely covers the wearer and all his equipment like a second skin, allowing the wearer to see, hear, and breathe normally. It rolls away from various parts of the body as needed, such as when the wearer needs to eat or access a backpack. Held items or items specifically excluded are not covered by a psychoactive skin.