here is a link about 'what to wear for yoga' and what not to wear... it says no jewellery though.
http://www.yogaprogramme.co.uk/home/...-wear-for-yoga
what to wear for yoga
... so you found your yoga class, you bought the yoga mat and now its time to sort out the yoga wardrobe. Read on how to put together the best possible ensemble:
What to wear for yoga
• Wear something comfortable and close fitting that allows a full range of movement. ie leggings and a sleeveless vest. Ladies could, if they want to, choose a top with an inbuilt bra for extra support. The point is to learn to breathe fully, so avoid underwired bras or anything too restrictive.
• Sweating is a natural and desirable byproduct of the practice, so wear something light to let the skin breathe. Just wear your yoga outfit once before you wash it. Otherwise it can develop an unpleasant odour, which may not be detectable to you, but it will be to those around you.
• Cotton is good, but there are other fabrics nowadays with a little bit of a strech which can be even better.
• We practice yoga in bare feet. A pair of clean socks can be nice (though not essential) during relaxation (savasana) .
• Bring an extra layer, (ie a hoody) or a pashmina shawl to wear at the end to relax. The idea is one creates internal heat and lifeforce at the beginning of the practice; and during savasana retains that heat and allows the energy to become reintigrated into the body. I use the same pashmina shawl since I started yoga, love how it has absorbed 'good vibes' over the years.
• Have enough yoga clothes, to wear a freshly washed set each time you go on the mat.
What not to wear for Yoga
• Baggy tops and bottoms with lots of extra folds, zips, belts or buttons. Anything too loose, will interfere with your practice. Ideally the teacher should be able to see how the body moves.
• Old, baggy, paint splashed sweats. (yes I have seen people come to class in those) Yoga is an ancient practice designed to lead to the path of wisdom, it is inappropriate to wear ones decorating/gardening outfit to practise. I should not need to say that, but at the other end of the spectrum, no one should feel obliged to buy expensive, 'designer' yoga gear.
• Anything not freshly washed! Disrespectful to oneself as well as everyone around us.
• Loose shorts with no underwear. I mean really guys - what are you thinking? You will be uncomfortable; and so will everyone around you!
• Anything too skimpy or see-through. I often do my practice wearing fitted shorts as I find them comfortable in warm weather. Please use common sense and make the distinction between shorts and bikini bottoms. (or bra tops!)
• Lots of jewellery. Personally, I do not wear any jewellery at all, during practice. Most people find it ok with a ring or two and may be a discreet bracelet. Dangly earrings, large pendants and armloads of bangles will distract the mind from the practice and possibly cause physical discomfort.