It makes sense, but it's not quite grammatical. When my friends and I were hanging out on the last day before I was to move to another state, we realized that we were all wearing yellow. We happened to all be wearing yellow that day.

It makes sense but the grammar needs to be fixed. :) "When my **friends and I (always "I" last) hung out (hang is present tense, hung is past tense) on the last day before I **moved (move is present tense, moved is past tense) to **another state (the other is incorrect. Use "another") , we realized that all our clothes were yellow (OR) , we realized that all our clothes had a yellow color (realized is past tense. So use had because had is past tense. Have is incorrect because it is present tense) "We happened to all wear yellow on the last day" (Need a noun. "All" and verb "wear") OR "We happened to all have yellow on our clothes, that day." (Yellow is an adjective describing a verb. Use an adjective to describe a verb or noun) Example 1 The clothes are yellow. ("Clothes" is a noun. "Yellow" is an adjective. "Are" is a verb.) Example 2 I wore yellow today. ("I" is a noun. "Wore" is a verb. "Yellow" is an adjective.) An adjective describes a noun. I hope this helps! :D Arigatou! Ganbatte ne!