You don't have to wear lederhosen to come to Waldhorn, but my theory has always been that it never hurts to wear lederhosen. Wearing a fun outfit is just good times right off the bat.
I've eaten at Walhorn 8 or 10 times over the last couple years and love everything about Gitta's restaurant. All of the food is excellent and I especially like the $5.50 "buffet" that is available to Waldhorn Beer Club members on Tuesday nights. I won't outline any particular meal for you because I've tried quite a few of them and have been disappointed by none. And the pretzel rolls are fantastic! It's the best pretzel bread you've ever wrapped your lips around. They have a wonderful German beer selection and you are given the ability to choose your drink size up to a full liter. I wish half pints would catch on at more bars Stateside.
Brian, the restaurant manager, is quite gregarious and will leave you with a smile on your face should you happen to meet him. After a couple visits to Waldhorn you kinda feel like you're family.