I fear people clearly perceive my flaws because they do it every time I'm uncovered and tell me "You're too thin, do more sports" or "Your skin is so dull!".
Anyway I've already tried wearing a t-shirt but ended up with putting my sweatshirt back on. A tshirt is not covering enough for me, though better than a tank top.
If a gentle breeze comes through the open window at the gym it makes me feel cold unless I wear my sweat tracksuit that keeps me warm and insulated.

The same is for my sweatpants: capri pants or similar things are by far less covering and cozy.

After yesterday's class some friends of mine accompanied me at a tailor's shop where they asked the lady to give an estimate on making my sweat tracksuit lighter and more breathable. The seamstress looked at my sweatshirt and said it should not be too difficult. For a little money she offered to detach the inside polar fleece lining by unsewing it away from both the sleeves and the trunk. After that my sweatshirt would be waaaay lighter and should lose more than half of its warmth and insulation. Obviously polar fleece, when unsewed, would be thrown away.

Then she would cut the high neck transforming it in a V neck instead, though she would have to cut away the "NY" patched embroidery too, because with a V neck that part of the garment would not exist anymore.
As for the zipper, it would be cut away too and replaced by three front buttons, from the V neck to the bottom.

Similarly the sweatpants would be lightened and their polar fleece lining cut away along with the bottom part of them, so that I get capri pants.
My friends think I should accept this opportunity so that I could wear my souvenir of new york without being bulky and too warm for the gym.
I don't know whether I should transform my tracksuit or not, but I think they are right and I should convince myself.