American Retro Illustration-What are the characteristics of retro illustration style design?

What are the formats of American retro-style illustrations on T-shirts? Generally, CDR format is better, so is printing.

Different from the current trend of Oversize version, RingerTee is different from most T-shirt styles that people usually come into contact with. In addition to the details of collars of different colors, its overall version is a bit narrow, and the sleeves are less than 5 minutes long, which is a bit tight and obvious.

Or a white T-shirt, or a rougher and thicker texture to "flaunt" the retro effect.

What are the characteristics of retro illustration style design? The color of retro style is khaki, followed by floral, lace and chiffon. For example, a floral chiffon top with flounces is matched with a khaki high waist skirt and some retro trinkets. Boy: Hats are used the most, followed by suits, vests and plaid shirts.

What is the specific style of this color illustration in the picture? I think it's a little European and American, because the strong color contrast has a lot to do with the painting styles of European and American countries.