tightly fitting vs tight fitting

tightly fitting and tight fitting both are adjectives.

Word	Noun	Adjective	Verb	Adverb
tightly fitting	No	Yes	No	No
tight fitting	No	Yes	No	No

As adjectives, tightly fitting and tight fitting are synonyms defined as:

Other synonyms of tightly fitting include skinny, tight-fitting, tightfitting.

tightly fitting (adjective)	tight fitting (adjective)
fitting snugly	fitting snugly