For me it has nothing to do with making me more lucky or confident or other things that have been mentioned ... If I am at home and playing online then comfort is king ... shorts .. sweats .. whatever .... if I am in public I will dress in what I feel is appropriate, which could be jeans, boots, sports coat likely something similar but something more than just a t-shirt and while I don't feel a t shirt is inappropriate in any way .. it's just not me ....
I was brought up to understand that putting your best foot forward is important .. not just in how you look but how you act and carry yourself ... these days it's not uncommon to see people wearing pajamas, and flip-flops where I play .. if that was the best I could do you would never see me in public 😛