Greek and Roman garb for summer events

I am combining these two types of garb because the first seems to flow into the second and my quick research seems to confuse the two.

For example, I am unclear on the difference between a "peplos" and a "chiton". The difference may be whether the side(s) are open, if there is a fold over at the top of the garment, no sleeves or sleeves created by pins, or the time period in history it was worn.

Either way the garment was secured on the wearer by use of pins; the only name I found for these pins is fibula. Some ways to approximate these pins are

1. Use safety pins: they are cheap, sharp end covered, but have a risk of opening unexpectedly. 
2. Tack the pin points with hand sewing and a pretty metal colored button: this is solid and won't easily come undone and is decorative, with the downside of needing a seam ripper to resize as the kid grows. 
3. (Not tested) use a pair of simple vintage metal pin brooches instead of safety pins
4. (Not tested) sew the pin points without buttons and clip vintage metal colored clip on earrings on the stitches: solid but still allows customization each wear.

Encyclopedia Britannica mentions that girls would wear the over fold extra long so it could be shortened by moving the pin points as the girl grew. I suspect that the fabric was also a bit wider to accommodate for growth around, and that boys more often were wearing tunics (neither point is mentioned in the encyclopedia). If choosing large fabric for a child I suggest starting with fabric suitable for a parent of similar body type with minimal drape, and then pin and belt to kid size (Not tested). Small scraps of linen/cotton that are too small to make other projects but wide enough to cover the child are also a good choice, they may out grow it but it was scrap anyway. 

There's also a common SCA variation that uses no pins and resembles a modern pillowcase dress. My quick research did not provide documentation for this style, but maybe someone has done deeper research on it. Here are a few links to get you started.

• The Mother Huddle This one uses fat quarters to build the fabric first, not a step needed for garb.
• Melly Sews This one is designed for an adult but you calculate your own pattern.
• https://youtu.be/AGY3Z-KaKLU?si=XJrS6pAkKgZL5msF A YouTube video

Also get the child involved:

• Let them pick buttons
• Block printing is seen on many SCA garments.
• Have the child weave or braid a belt from yarn or rope: I've seen classes on Kumihimo and stick weaving which may be good mediums.
• A child ready for sewing could be tasked with hems for the fabric as they are straight edges.