Not if I was judging - and there were 5 female judges & 3 male judges on the panel at Blackpool.
In response to your queries, I do not consider it a problem if a competitor wears a costume that 'jingles', provided it isn't so loud that it distracts other competitors and the judges. However, you might wish to consider also whether it would distract your partner or the 'bits' might get in the way of certain moves. If it is a belly-dance outfit, consider also the likelihood of the beads or coins being ripped off during energetic moves. No one, least of all the judges and organisers, will be impressed if your beads & coins fall onto the dance floor and cause a hazard to others.
As far as I am aware, there are no 'unwritten rules' about costumes for MJ competitions. You just need to be sensible in your choice of what to wear - here 'sensible' should be read in the context of dance competitions. Exposing a great deal of flesh is usually not a good idea. I have seen many female competitors who wear minimalist outfits but whose standard of dancing fall way short of the image they are trying to project. IMO That can do more harm than good. It certainly isn't going to win points with female judges. However, exposing a long leg-line (for those ladies with nice legs) by wearing a dress/skirt with a slit, or a short and sassy skirt teamed with high-heels, can enhance your overall appearance. Dancing, after all, draws attention to the legs & feet, hence a little more effort in those departments can be rewarding. Trousers can be just as attractive, if properly fitted and decorated.
As for where to get outfits - buy, beg or borrow. E-bay as you have discovered, is a good source. Dancewear shops and costume agencies. Dressmakers. Or make your own. Customise items from high street stores. Borrow from other competitors.
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