which design (it is said) served as a base for the Tokugawa Aoi

Like with all Karate jackets

This model is made of a composite fabric polyester/rayon

That was motivated by the fact that Aikidogi have fairly short sleeves and don't need to have sleeves fitted at the wrist (as in Judo)

who is known to have used this Tsuba on his Katana

Deluxe Tanto - Classic Woods noModification which design (it is said)Deluxe Tanto Red White Oak Made in Japan (Kyushu) Flat Spine Rounded butt Short Kissaki Red Oak, White Oak available Just like the Deluxe bokken, our deluxe tanto are available in white or red oak. They are made out of a single piece of wood from the south of the Kyushu islands (Japan). The shape and length are resolutely classic, making it a standard tanto that will be appreciated by all aikidoka. Choice of wood species: red oak, white oak. Available