The light fabric tanks are more useful for overheating. I ran into the limits of garment with this for the first time truly when visiting Sicily in August. It was literally too hot for me on the streets. Which meant to avoid overheating I didn't wear my garments while touring during the day and wore the loosest linen I could find in the markets to allow my body to properly sweat. My SIL lived in a very hot and humid area in peru and when they talked about getting endowed in relief society, the biggest barrier to the sisters wanting to was the heat and wearing garments in them. There's areas of the world and the US where just a little more adjustability can make a world of difference. And with the garments as is, to make an outfit work with g's with women's clothing means needing layers. So I can often be wearing 3 to 4 layers of fabrics in the summer, making light summer friendly outfits suddenly very warm. When this happens, the garment layer often becomes a glorified sweat collector.
Unless you can find just the right shirts that are already garment friendly. Which can become more of less available depending the style that year.
As an aside, I'm also looking forward to getting my husband some to reduce pit stains. His garments would last longer if it were for that. I buy pretty expensive deodorant to help reduce them. No way will I get my husband to do that too.
With luv,
BD