The suit is DARLING! I think it looks perfectly nice together. I am not sure I would have known it was a 50's suit unless you told me. I think the pieces together look wonderful though you know I would opt for a high contrast top in white or cream. I love all of the combinations save for 1 and 6 but chalk that up to my love of high contrast. The proportions are fabulous in all 6. I especially love the leopard scarf and moto jacket combinations. I did not see the flats coming (very refreshing!) the polkadot hosiery and electric blue ballet make the combination unexpected and fun.
Styling ideas - I think the jacket would look best with pastels ironically enough. The detailing is very feminine and I think a simple tee or shell in pink or ice blue would play off that femininity but not take it over the top. I even like the idea of brights like citron and cobalt (you've already done lime) would be wonderful combinations.
As for the skirt I LOVE the box pleats. I was actually thinking long pencil skirt in my mind when you were describing the skirt. I like the idea of a maryjane single or double straps with this skirt in addition to a heeled loafer. I say definitely play with hosiery in different colors and patterns As for tops a cropped cardi would be cute I am also thinking of a fuzzy short sleeve crewneck sweater with a contrasting long sleeve tee underneath. Oh I know what would be perfect -- a crisp button down and a cardigan (slim fit) in a rich jewel tone, red, oxblood, plum, emerald or gold. Scrunch the sleeves and allow the shirt cuffs to fold over the sweater sleeves. I would even do a tipped sweater or jacket too -- but watch the length you'll need jackets and sweaters to be on the shorter side to avoid overwhelming the a-line of the skirt. What a great find Ingunn! I hope you enjoy this suit for years to come.