Unfortunately, no; working out in a sweat suit will not help you burn more calories. You may initially lose water weight from perspiring more, but you are not actually losing extra body fat. The water weight you lose will quickly be replaced once you start drinking water following your workout. This technique has been made popular by athletes trying to "make weight" for their competitions. The best way to burn more calories is to participate in activities that will raise your heart rate, as well as strength training activities that target your large muscle groups. Interval training and circuit training are great ways to do this.
Sweat suits will typically cause an increased water loss which is not burning more calories but losing more water. I guess you could argue that the weight of the sweat suit could cause additional calorie expenditure but that would definitely fall under the category of splitting hairs. Sweat suits increase sweat and that means increased water loss.
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Important: This content reflects information from various individuals and organizations and may offer alternative or opposing points of view. It should not be used for medical advice, diagnosis or treatment. As always, you should consult with your healthcare provider about your specific health needs.