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not really. but it really depends xD. lads... lol.
anyway. jeans and a tshirt are fine for certain things- its really casual.
if I was going out with the girl- I would like her to dress up and spice up a bit for a date.
so yeah. initially tho- a guy might not be as attracted to you as much, because you don't really stand out in the clothes- but that will probably help in making sure the guy you actually date is a good one.