I am most interested in buying a kimono or 2.
For kimono, it's a matter of learning to get dressed in it correctly, not a matter of buying the right size. Among Japanese, women with small waist and full breast and hips would have to wrap some towels around the waist to "even it out," so to say, before putting on the kimono :) That's simply how "traditional" garments are made.
BTW, do you really mean the full, proper kimono? It takes a LOT of pieces of garment to put on a full set (undergarment, several belts/sashes, "socks," so to say, shoes, etc.), and some training to get dressed in it. Of course if you have someone who can dress you up in it properly, that's OK.
For summer, you could consider getting what is called "yukata" - a light cotton version of kimono, which you can put on casually, just over a regular camisole and petticoat, and with a sash belt, and sandal-type shoes on barefoot. If you come in summer, you will find a lot of them in stores. Have fun!