I'm going to a no-gi seminar this afternoon. I have never done any no-gi training. So this will be a really stupid newbie question. What is normal attire for no-gi training? I don't own a pair of shorts that aren't denim so that leaves sweats annd gi pants. I don't have a rashguard but I do have an under armor shirt I wear when lifting. Is that close enough or is a t-shirt ok? Thanks in advance.