Where to get a high quality Ghillie Shirt (100% cotton)

[Janner52]

This (and probably several other discussions on this forum) distill down to a tension among

1. What looks good
2. What's "authentic" (either as contemporary or historical dress)
3. Where is it being worn

The kilt is a versatile garment and as such may be worn in any circumstances from white tie to hillwalking.
I am not sure if authenticity comes into it unless you are trying to recreate some historical event.

What looks good is probably a matter for the individual to decide and we have seen some examples of individuals who are not too good at making that decision. In my humble opinion as an Englishman, with a military background, the important thing is to wear the kilt in a way that looks like you have made an effort to learn how to do that correctly and does not insult the kilt or the highlanders who are rightly proud of their heritage.

The choice of upper body garments obviously depends on where or why. The more formal options, white/black tie lounge suit (a dated terminology) and sports jacket all have their modern equivalent designed for the kilt. Other than that pullovers, shirts long or short sleeved, polo shirts and T shirts (see tartan army) will work in the correct circumstances. In fact most tops or outer garments that would be worn with trousers. Possibly with exception of Hawaian shirts.

My point is with all of these options why would anyone want to attempt to recreate some sort of historical attire? The exceptions being reenactments or themed events.