Praise be to Allah.
The piece of cloth that is worn as a kind of underwear for the lower part of the body, as mentioned in the question, is not one of the things that are prohibited when in ihram, because what is prohibited is wearing pants and, similarly, underpants that people ordinarily wear, unlike the piece of cloth mentioned in the question. If it resembles the izaar (lower garment) in that it is wrapped around the body, and is not tailored to fit the body, then it is acceptable.
However, if it is tailored to fit the part of the body that it covers, but it is held together by the snap fasteners, instead of being held together by thread with which the garment is sewn, in the manner of garments that are worn over that part of the body, such as underpants, shorts and the like, then in that case it comes under the same ruling as pants and it is not permissible for the muhrim (pilgrim in ihram) to wear it.
See also the answer to question no. 79025.
With regard to the two metal snap fasteners for securing the garment, there is nothing wrong with that, so long as the rida’ – or piece that is placed on the upper part of the body – does not appear to be like a shirt or chemise that is tailored to fit the body. Nevertheless, it is preferable to avoid that.
Shaykh Ibn ‘Uthaymeen (may Allah have mercy on him) said: It is better not to pin one’s rida’; rather it should be worn over the shoulders. But if he is working as a cook or is serving coffee and the like, and wants to hold his ihram together using a pin, there is nothing wrong with that. But with regard to what is mentioned in the question, about some people fastening it with pins from the neck to the navel, so that it becomes like a shirt or chemise, I am not too sure about that, because in that case it will resemble a chemise, and the Prophet (blessings and peace of Allah be upon him) said concerning the muhrim (pilgrim in ihram): “He should not wear a chemise.”
End quote from Majmoo‘ Fataawa Ibn ‘Uthaymeen (22/135)
And Allah knows best.
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