Frill Sleeve Blouse The Frill Sleeve Pattern Hack Maven Sewing Patterns & Sustainable Long Sleeve Tee Frill edge long sleeve t shirt Nicci Boutiques. Crafted from our premium modal fabric, the Seville Frill Neck Long Sleeve Tee combines style with comfort. Featuring a subtle high neck adorned with delicate frills, along with matching frill details on the cuffs, this top is the perfect blend of elegance and ease. Soft, breathable, and designed for layering, it's the ideal piece to wear under your favourite knits for a cosy yet refined look.