I am looking for a word that describes a person that does not like to dress things up, whether it be people, ideas, objects. Almost the idea "simple man" but as an adjective?
often not capitalized : marked by simplicity, frugality, or avoidance of luxury and comfort a Spartan room [Merriam-Webster]
Also possible are austere, abstemious, and ascetic.
austere: severely simple or plain; an austere design
abstemious: moderate or sparing, esp in the consumption of alcohol or food; temperate
ascetic: a person who practises great self-denial and austerities and abstains from worldly comforts and pleasures, esp for religious reasons
The definition of modest (Dictionary.com) fits well:
1) having or showing a moderate or humble estimate of one's merits, importance, etc.; free from vanity, egotism, boastfulness, or great pretensions.
2) free from ostentation or showy extravagance: a modest house.