How one should use Angavastram ?

Upper garment at waist:

Sachsaritrasuthanidhi:

‘pradakshine praname cha devata–guru sannidhau
vastra nishpetene snana upasthane apivadane
dharyam katyam uthariyam pitrukarye suralaye’

‘The upper garment is to be at waist;
In temple and in front of God, with acharyan (guru, teacher), during pradakshinam (circumambulation), during pranamam (respectful salutation), during bath, vastra nishpetenam (after bath, water is removed from the soiled cloth with mantra once and without mantra once later), during apivadanam (after namaskaram or before), upastanam, pitrukaryam (ritual for ancestors).’

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Reference:

Sri Vaishnava sadachara nirnaya, Sri Krishnamacharya (present H.H. Ahobila Mutt 45th Jeer Swamigal), Published year 1990, Page 414, Total Pages 668 +176 + 16 + xviii + 68

Pancharatra Pradipa:

Pancharatra Pradipa gives the following guide to cloth during temple worship:

A devotee should not wear dirty cloth, especially when cooking or worshiping the Deity. Used cloth that has not been washed and dried again is considered unclean. Cloth worn while sleeping, passing urine or stool, or having sex is unclean. Cloth that touches anything impure, such as wine, meat, blood, a dead body, or a woman in her menstrual period is also contaminated. Cloth
washed by a public laundry service and cloth that, though washed, has become stale are also unclean and therefore unfit to wear during Deity worship.

While worshiping the Deity, you should not wear the following types of cloth: brightly-colored cloth (for men), damp cloth, cloth that is too long or too short to be worn properly, STITCHED OR SEWN CLOTH (FOR MEN), torn cloth, oil- or dirt-stained cloth, soiled cloth, burnt cloth, or cloth chewed by animals or insects. However, you may wear silk many times before washing it, provided it has not contacted anything impure or been worn in impure places.

Unbleached, raw matka (ahimsa) silk is the best for pooja. Sheep's wool is said to be always pure, but still, you should not wear ordinary woolen cloth when worshiping the Deity, because wool particles may fall on the Deity's paraphernalia. However, you may wear wool cloth if it is very fine (no shedding wool) in which case you should reserve