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It is already transparant, wat your viewing is the lower part of the swimsuit underneath it.
2 shades of red will make it alot darker.
Use the F keys to zoom and mouserotate, you prolly will see.
The swimsuit is already partly transparent; since the alpha area for the swimsuit is not perfectly white, some of the skin will show through. If you put it on an actual Sim (and not a grey Body Shop mannequin) you'll be able to see the transparency better.