Hmm interesting. I honestly felt that cap sleeves make my arms look fatter and sleeveless looks better. If you notice, the majority of wedding bridal shoots in the magazines are sleeveless. I just ordered my outfit in sleeveless from sana safinaz and wondering if I should have gotten sleeves.
Probably because its cheaper to make a sample thats sleeveless (less fabric, less kaam). Plus unless you have arms like those models, a sleeveless bridal is just going to look bad. At least, short sleeves suit almost everybody.