I thought this article was interesting. It focuses on low-vision Deaf but many of the principles still apply. Here is an excerpt:
Dressed to Distress?
By Tara Potterveld, MA, IC/TC, CI and CT, California, and Marylouise Lambert, BA, OTC, California
Copyright VIEWS, Registry of Interpreters for the Deaf. Reprinted with permission.
"I am a Deaf person who has Usher's Syndrome. I went to a low vision clinic at a prominent research university to have my eyes checked. A fair skinned interpreter showed up wearing a shirt that was pink on one side and yellow on the other. Needless to say, I could not see the interpreter's hands against this minimally contrasting background. By the time my driver ran to the car to get a black jacket for the interpreter to wear, we were twenty minutes late starting the appointment."
... as interpreters, we should make it easy for Deaf people to read our signs...
"...if your skin is very dark, you'll want a top that offers as much contrast as possible and at the same time reflects as little light as possible. A soft cotton top that is medium to light gray color is generally a good choice. A `not too bright' yellow is good ... If you have very light colored skin, tops that are black or navy blue are absolutely the best choice for people with retinitis pigmentosa ... People with optic atrophy, rubella, or cataracts often prefer a brighter color such as aqua blue, emerald green, or even dark pink." (p. 113) Smith also notes that the clothing fabric should be non-reflective, soft rather than shiny, and that "touchy-feely clothes that are tactually beautiful are always nice." (p. 109) When interpreting for consumers regularly, it is helpful to ask what clothing colors they prefer the interpreter to wear.
...keep your fingernails short and smooth. "I prefer the interpreters not to use fingernail polish as even clear polish reflects light."
"Because of reflected glint and glare, which is distracting, I appreciate when interpreters remove body piercings and other jewelry when working with me. Unfortunately, even shirt buttons in strong light can flash bits of light to my brain, making it hard to concentrate on the signing."
We are proud to be in a profession where our colleagues put so much effort into developing and enhancing their skills. We appreciate the dedication and hard work of all interpreters. Those fine skills are of little use, however, when an interpreter arrives at an assignment wearing clothing, jewelry, or nail polish that make it impossible for the Deaf person to take full advantage of the interpretation.
The responsibility for ensuring that a consumer's interpreting needs are appropriately served belongs to the agency, the interpreter, and the consumer. If each of these participants assumes responsibility for making the interpreting environment the very best possible for the consumer, these special accommodations are more likely to be discussed and implemented and true professional service rendered.
For more, read:
http://www.tsbvi.edu/Outreach/seehear/winter01/dressed.htm