We learned in the Mishnah that Shaatnez may be sent as a gift on Yom Tov. The Gemara explained that one may use it as a curtain. Elsewhere, Ulla explains the reason a curtain can contract tumah - because it is sometimes used as clothing by servants who wish to warm themselves with the curtain. According to this, then, it should be forbidden as Shaatnez?

Resolution: Only hard shaatnez [which cannot be used as a garment] is permitted to be sent on Yom Tov. As Rav Huna brei d’Rav Yehoshua taught: Hard felt of Neresh may be used [as seats, even if they’re shaatnez].

The Rov learned Tosfos* here.

Rav Papa: Slipper clogs [which are hard] are not shaatnez.

Rava: Bags made to hold coins [which are then kept in one’s bosom] are not shaatnez [because the coins cause the contact with the body to feel hard, and it is not soft like a garment]. Such bags holding seeds, would pose a problem of shaatnez.

Rav Ashi: Neither coins nor seeds can be considered shaatnez, since it’s an unusual manner of clothing.

_______________________________________* Tosfos: The Paroches [curtain] of the Mishkan was capable of contracting tumah even though Ulla’s reason does not apply? The answer is that since the Paroches bends over the Aron it can be an Ohel. Once it is considered an Ohel, it may be considered a keili and would become tamei in all ways. Rav Shmuel of Ivri: When they travelled in the Midbar, they would wrap keilim in the Paroches, so it’s considered like a blanket which is surely capable of contracting tumah. 

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