1. There is a dispute about the type of clothing on which the Torah requires that Tzitzis be placed.
2. Rava explains that there is a difference between wool and linen clothes and other clothes regarding the law of Tzitzis.
3. The Gemara discusses what is derived from the verse (regarding Tzitzis), "And you will see it."
4. If one made a structure from an item that grows from a tree, it does not become Tamei if a corpse is underneath it.
5. Flax is called a produce of a tree.
A BIT MORE
1. One opinion says that "clothing" means only items made of wool or linen (see Daf 26, #4). Rava says that it can refer to all types of clothing.
2. Wool or linen Tzitzis may be used to fulfill the Mitzvah of Tzitzis on a garment made from any material. Tzitzis made from any other material may be used only for a garment of the same material.
3. The Gemara concludes that this means that a garment normally worn only at night is not obligated in Tzitzis.
4. This is like the law of any house which contains a corpse, where everything in the house (besides the house itself) becomes Tamei. An exception to this rule is flax; if the house is made of flax, the house also becomes Tamei if a corpse is in it.
5. This is derived from the verse in Yehoshua, "And she hid them in the flax of the tree."