Target's line of women's plus size swimwear has a style for anybody and they continue to add One of their suits is what was my “gateway” into the bikini world. Traditional, well-fitted, sizes that you probably know plenty about – Old Navy. Michael Kors Swimwear Plus Size Solid Deep V Twist One Piece Swimsuit. Swim Dress This swim . Aqua Sphere Women's Plus Size Nala One Piece Swimsuit. Sweetheart . I have a big stomach and very thick thighs and a really big butt.