Two meanings:

Seems like §

Recipe: adjective/verb + そう

• create a new (な) adjective by grafting そう onto an adjective/verb

e.g.,　高い服　→　高そう服

I heard §

Recipe: statement + そう + (だ・です)

• completes a statement (+ だ・です)
• does not change any adjective/verb

Examples §

• 美味しい　→　美味しいそうです
• 綺麗(だ)　→　綺麗だそう