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Wear comfortable clothes. One of the major goals of meditation is to calm the mind and block out external factors - however, this can be difficult if you feel physically uncomfortable due to tight or restrictive clothing. Try to wear loose clothing during meditation practice and make sure to remove your shoes.
Wear a sweater or cardigan if you plan on meditating someplace cool. If you don't, the sensation of being cold will consume your thoughts and you will be tempted to cut your practice short.
If you are in the office, or somewhere that you can't easily change your clothes, do your best to make yourself as comfortable as possible. Take off your shoes and jacket, open the collar of your shirt or blouse and remove your belt