"Blocking involves, drawing the design, cutting the pattern piece apart, adding the seam allowances to the new cut edges and sewing the pieces together to make it one piece." --from Kwik Sew's Swim and Actionwear book.
I first tried this technique last year on this suit for my middle daughter.
We used the basic racerback tank (Kwik Sew 3785 is the current pattern) and cut it to be a 2-tone suit. We thought the stripe might be just a little much for the entire suit. M. loves this suit. She received a ton of compliments on it last year too. This year it seems a little snug; however, she wants me to add another little piece into it so that she can still wear it. Since I still have both of these fabrics I may just start from scratch and go a size larger for her, because it was a cool suit.
Here are this year's suits using color blocking techniques:
Tikki Hut Print Suit
Added a stripe at the empire waistline as this print was extremely busy and the 10 yr. old friend it is for needs a little visual definition there. M. thought it looked cool.
Navy & Floral Suit
Did this one for my youngest as I didn't have enough of the floral piece to do an entire tankini. So we used it for the bottoms and the contrast to the navy top. I really like this look.
Here is a little detail close-up of the straps and how they cross each other in back.
**By the way, I have swimsuits available for purchase in my shop at Etsy. Or drop me a note if there is something specific you are looking for and we can work something out.