The Puritan pastor Matthew Henry put it this way:
"The purity of the heart will show itself in the modesty of the dress."
Something to read, refresh the memory, and think on:
Thinking Like a Christian About Modest Apparel (mountainretreatorg.net)
Here are a few ideas for some spring and summer clothing choices:
This is a very comfortable styled dress that many body types could wear but for modest reasons it would need buttons on the front placket. That would finish it off very nicely. A variety of trims could be used instead of ricrac. There used to be many woven braids available years ago. I haven't checked in our local JoAnn's lately. Otherwise one might find some online.
There are similar dress patterns with tiered skirts in pattern books that would work as long as it is "modestly" made.
A very simple shirtwaist in summer fabrics would make a comfortable outfit.
This is the shirtwaist pattern from The Assembly Line. I would add a few more buttons on the skirt especially in windy areas.
Summer Skirts
Here is a very lovely linen skirt from etsy.
Summer blouses
Retro Style
This is a blouse that is pretty and fairly easy to make. It is called the Billow Blouse by The Assembly Line Pattern Company and can be worn with skirts for an elegant look or depending what fabrics are used it could be for a more casual setting.
Whatever you sew and wear and do make sure it is for the Glory of God.