I like things baggy, and being I'm a big girl, I tend to have to go into men's stuff anyway if there isn't larger than an XL for women (I can do some men's XLs). The problem is that clothes seem to be longer the bigger size they are, and at 4'10" t-shirts always go down to at least my elbows and knees. There seems to be a good portion of us that are on the short side; I think if you could find a balance that isn't the weird, cap tiny sleeves of women stuff nor the wide shoulder, really long t-shirt sleeve of a guy's shirt, you'd have a winner.
I also don't get why they always have to be in pink. I personally hate pink. Why not some purple? It's a girly color (and doesn't make my eyes bleed). Or blues, greens, whatever. I do like that the Traceuse shirt you offer, and felt bad about all the nasty thoughts I had when I saw the picture and thought it only came in pink. Thank you for giving non-pink options.
How about a Traceuse hoodie? I'd probably buy that before a t-shirt, personally. (Assuming it fit, obviously. Though I get I'm not average and fully understand and respect why you wouldn't bother making/stocking plus sizes. Just saying if I had the option, I'd like a hoodie.)