A way we sew collar bands works for all kinds of collars. Here’s a round collar band on a blouse made from poly double georgette crepe. A round collar band lies flat against the neck, it doesn’t ‘stand up’ like a classic collar band, but the technique is the same.
Here’s a quick tip for matching stripes on the cross grain: draw a guideline perpendicular to the grain line on the sleeve and front and black pattern pieces, as shown in the picture. Make sure the line is at the same position - about an inch below the armscye - on all pieces. Use this to align your stripe across all the main body parts of the shirt. This will make sure your front matches the sleeves and the sleeve matches the back.