When we serve in Mexico as believers, we are making ourselves to be examples of the ONE who sent us.  So we should conduct ourselves respectfully according to the culture of the area we are serving.  We do not want to come into their country boastful of what we have versus what they lack, but rather bring ourselves to their mindset, and humble ourselves to get along with less comforts while we are there.  Our idea of "roughing it" or camping out, might be the regular daily existence of a patient we serve.  The shoes on their feet are likely the only ones they own, and the clothes that are soiled that they wore to our clinic might be the best they own.  It is easy to think highly of ourselves in comparison to these less fortunate souls, and if you do subconsciously, it may translate though your spirit as obvious and arrogant.  So "check" your spirit and your tongue at the door to the airplane as you depart, and enter a new place within your spirit where HE resides and guides you in behavior and speech. 

Women should dress modestly with long pants or dresses or skirts to the knee, or scrubs and white coat in medical attire. Avoid low cut and revealing  tops or shorts when working with the patients and in public as a team.  Try to dress not to impress or draw undue attention to yourself or shape.  Men should not wear tank tops or tight muscle shirts or shorts in the clinical setting.  Professional attire should dictate your professional presents.  Denim pants are OK in any setting usually, but scrubs in a clinical setting will make men and women look more clinically professional.  A scrub or while coat top with denim pants will usually be fine as well.